was a Japanese politician and leader of the Japan Socialist Party. Known for his large stature and powerful voice, he tirelessly toured the country delivering speeches, earning him the nicknames "speech-making everyman" (enzetsu hyakushà Â), "human locomotive" (ningen kikan-sha), and the affectionate "Numa-san".
In the prewar years, Asanuma was a forceful advocate of socialist policies and tenant and farmer rights. During World War II, Asanuma aligned himself with the Imperial Rule Assistance Association and supported Japan's war in Asia. In the postwar period, Asanuma resumed forceful advocacy of socialism and sharply criticized the U.S.âÂÂJapan alliance, making him a polarizing figure.
In 1960, Asanuma was assassinated with a wakizashi, a traditional short sword, by 17-year-old far-right ultranationalist Otoya Yamaguchi while speaking in a televised political debate in Tokyo. His violent death was seen in graphic detail on national television by millions of Japanese, causing widespread public shock and outrage.
Asanuma was born on 27 December 1898 in the village of Kamitsuki on the island of Miyake-jima, a remote volcanic island that is administratively part of Tokyo, as the illegitimate son of Hanjirà  Asanuma (1861âÂÂ1951), the village headman, and his concubine Yoshi Asaoka.
Asanuma's mother raised him on Miyake-jima until he was about 13 years old. In his memoir, Asanuma recounted a childhood incident: after a reckless act as a schoolboy, his mother scolded him so severely that he fled in fear and later hid inside a rice straw bag (tawara) upon returning home. He described her as strict yet devoted, raising him alone in straitened conditions.
His father, Hanjirà  Asanuma, later remarried Inoue Hisa and moved to Sunamura (now part of Kà Âtà Â, Tokyo), where he became a dairy farmer. Upon this remarriage, Hanjirà  officially recognized Inejirà  as his son and brought him to live in Tokyo. After attending Tokyo Prefectural Third Middle School (now Tokyo Metropolitan Ryà Âgoku High School), Asanuma enrolled in the preparatory course at Waseda University in 1918. He rejected his father's wish that he become a doctor, leading to a temporary estrangement. To support himself, he worked at a stationery company run by a friend, where he made fountain pens. During his university years, he belonged to the oratory club and the sumo club (making use of his strong physique), and he also competed in races with the rowing club. He later recounted that the university's founder, à Âkuma Shigenobu, had praised his build.
While still in college, Asanuma became involved in various forms of leftist activism. Among other activities, in 1919 he founded the "Builders League", which studied the works of English socialists, worked for Russian famine relief, and protested against military-related research being conducted at Waseda.
During a protest rally against a student group cooperating with the military (the Waseda Military Research Group), he gave a speech and was physically assaulted by athletic club members and right-wing groups (Waseda University Military Research Group Incident). When the Great Kantà  Earthquake struck in 1923, he was attending a meeting in Gunma Prefecture. Upon returning to Tokyo, he was arrested by soldiers, detained in a cavalry regiment guardhouse, and later imprisoned in Ichigaya Prison, where he was beaten by guards for his attitude.
Asanuma graduated from Waseda University's department of Political Economy in 1923. On December 1 1925, at the age of 26, he was appointed secretary-general of Japan's first unified proletarian party, the Farmer-Labour Party, but the party was forcibly dissolved by the government just one hour after its formation, citing the authority of the recently passed Peace Preservation Law.
In 1926, Asanuma was one of the main founders of the similarly named Japan Labour-Farmer Party, as part of his efforts to link urban labor movements with rural peasant's movements. However, Asanuma left the party after it split into right, center, and left factions, and became involved in tenant organizing and the Labour-Farmer movement.. In 1932, the fragmented proletarian parties were united to form the Social Masses Party, which Asanuma also joined.
Deeply admiring secretary-general Hisashi Asà Â's character, he supported Asà Â's national-socialist line aiming for social reform through cooperation with the military. Thereafter, Asanuma took a position supporting the military's war policies. Representing the Social Masses Party, Asanuma was elected to the Tokyo City Council in 1933 and to the House of Representatives for the first time in the 1936 Japanese general election.
In 1939, Asanuma participated in a Japanese parliamentary delegation to the Inter-Parliamentary Union conference in Oslo, Norway (August 1939), traveling through the United States and Europe from June to October. During the voyage, he read extensively from Ikki Kita (including History of Chinese Revolution) and held frequent discussions with Reikichi Kita (younger brother of Ikki Kita, also a delegation member). He expressed strong admiration for Ikki Kita's passionate nationalism and for Shà «mei à Âkawa (whose 2600 Years of the Japanese History he read, noting that its patriotic ideas "seeped into his body"). These readings reinforced his vision of a new East Asian order as "supra-national regionalism" rather than imperialism.
While in Europe, Asanuma observed wartime preparations in Germany and the outbreak of World War II (Germany's invasion of Poland on 1 September 1939, which he learned of in Berlin). He recorded factual impressions of Hitler's oratory and the disciplined atmosphere in Nazi Germany at the time, viewing the European conflict pragmatically as a potential opportunity for Japan's independence and ethnic unity in Asia (not as ideological endorsement). These were his contemporaneous observations during the crisis.
In 1940, when Takao Saità  delivered an anti-military speech criticizing the quagmire of the Second Sino-Japanese War, Asanuma voted in favor of his expulsion.
Upon the launch of the Imperial Rule Assistance Association in 1940, Asanuma was appointed deputy head of its temporary election system research department. That same year, Asà Â's sudden death deprived Asanuma of his spiritual pillar, causing him deep anguish. He declined to run in the 1942 wing-election, temporarily withdrawing from national politics. This decision later exempted him from postwar public office purges. In 1942, he ran for Tokyo City Council but lost due to interference by authorities. Following the establishment of the Tokyo metropolitan system, he ran in the first Tokyo Metropolitan Assembly election in 1943, won a seat, and was appointed vice-chairman. He listened to the Gyokuon-hà Âsà  (Jewel Voice Broadcast announcing Japan's surrender) in his apartment in Fukagawa.
In the immediate aftermath of Japan's defeat in World War II, Asanuma was one of the founders of the Japan Socialist Party (JSP). Upon its formation in 1945, he became organization director. With centrist leaders such as Jà Âtarà  Kawakami and Jusà  Miwa purged from public office, Asanuma naturally emerged as the central figure of the centrist faction.
In 1947, when secretary-general Suehiro Nishio joined the Katayama cabinet, Asanuma became deputy secretary-general, and the following year he was formally appointed secretary-general (and became the first chairman of the House of Representatives Steering Committee). In the 1949 general election, party chairman Tetsu Katayama was defeated, and in the special Diet session for prime ministerial designation, the JSP voted for Asanuma (though Shigeru Yoshida was actually designated). He temporarily stepped down as secretary-general but returned to the post in 1950.
That same year, during the early stages of the Korean War, he took part in a public blood donation campaign in Tokyo to support wounded UN soldiers. On 28 September 1950, Asanuma along with other prominent figures such as Chief Cabinet Secretary Katsuo Okazaki donated blood for the UN forces engaged in the conflict. Contemporary accounts, including NHK archival footage, describe the initiative as a response to casualties among UN troops following operations such as the Inchon landing and the crossing of the Nakdong River.
In 1951, amid internal conflict over the San Francisco Peace Treaty and U.S.âÂÂJapan Security Treaty, the left faction opposed both while the right faction supported them. Asanuma proposed a compromise-supporting the peace treaty but opposing the security treatyâÂÂin an attempt to reconcile the factions, but he could not prevent the leftâÂÂright split. As secretary-general of the right-wing JSP, he traveled nationwide tirelessly to support comrades, earning the nickname "human locomotive" for his vitality.
On 13 October 1955, following the reunification of the Socialist Party, Asanuma became secretary-general. Due to his role as secretary-general, when internal conflicts arose, he often acted as a mediator, pacifying both sides with "maa maa" (calm down), earning him the nickname "Maa-maa Koji" (ã¾ãÂÂã¾ãÂÂ屠士; roughly "Calm-Down Lay Practitioner" or "There-There Hermit"). His long tenure as secretary-general without ascending to chairman also led to the nickname "perpetual secretary-general" (ä¸Âå¹´æ¸è¨Âé·; Mannen Shokichà Â, lit. "ten-thousand-year secretary-general").
In April 1957, Asanuma led the Japan Socialist Party's First Goodwill Mission to China as its head delegate.
The delegation, which included Seiichi Katsumata, Tadao Satà Â, Ryà Âsaku Sasaki, Masaru Sone, Shichirà  Hozumi, Hideo Yamahana, and Tomomi Narita, met with Chairman Mao Zedong and Premier Zhou Enlai, among other Chinese officials.
On 22 April 1957, a joint communiqué was issued with the Chinese People's Institute of Foreign Affairs. It emphasized the promotion of diplomatic normalization between Japan and the People's Republic of China, rejection of the "two Chinas" concept, peaceful resolution of issues related to Taiwan, support for China's representation in the United Nations, and broader cooperation in economic, cultural, and people-to-people exchanges.
The visit aligned with the JSP's policy of sending goodwill delegations to major powers (including the United States and the Soviet Union) to advance its principle of unarmed neutrality.
After returning to Japan, Asanuma published a book titled The Path to Japan-China Cooperation (æÂ¥ä¸ÂæÂÂæºã¸ã®éÂÂ) in May 1957, summarizing the visit, his discussions with Chinese leaders, the joint communiqué, and his views on strengthening JapanâÂÂChina relations.
This trip laid groundwork for subsequent JSPâÂÂChina exchanges, including Asanuma's second visit in 1959.
In 1959, as leader of the second JSP delegation to China, Asanuma endorsed the PRC's "One China" policy and declared "American imperialism is the common enemy of the peoples of Japan and China". The speech draft was prepared by the left-wing Kenichi Hirosawa, whom Asanuma called "gokusa" (extreme left). The explicit naming of "American imperialism" as the "enemy" caused a major stir domestically and internationally. The Liberal Democratic Party's Takeo Fukuda immediately sent a protest telegram, successfully framing it as "Asanuma's gaffe". The image of Asanuma disembarking at Haneda Airport wearing a Chinese worker's cap drew criticism from the right wing, public opinion, and even within the party. Right-wing delegate Sone Masaru and others stated they could not agree with the secretary-general's attitude. Left-wing chairman Mosaburà  Suzuki reportedly scolded Hirosawa, saying "What on earth were you doing as Asanuma's secretary?"
According to a 22 September 2015 Sankei Shimbun online article, shortly after returning, Asanuma was questioned by U.S. Ambassador Douglas MacArthur II and backed off his comments after being shouted down while attempting to explain. However, according to an interview by Akihisa Hara with Seiichi Katsumata, Asanuma refused to retract his statement, leading to a prolonged argument and cancellation of the planned meeting. According to the official JSP account "Maishin: The Struggle of Inejirà  Asanuma", when Asanuma visited the U.S. Embassy on 24 May 1960 after the forced vote on the Security Treaty, MacArthur strongly demanded retraction, but Asanuma refused, stating "There is no need to retract. This is not an attack on the American people; fighting imperialist policy is natural for the Socialist Party."
Scholars suggest Asanuma's statement reflected repentance for damage caused to Chinese people by Japan's participation in aggression since the Mukden Incident. Reportedly, Hirosawa prepared milder alternatives like "issue" instead of "enemy", but Asanuma deliberately chose "enemy". However, Seiichi Katsumata claimed the phrase "American imperialism is the common enemy of the peoples of Japan and China" originated with Chinese leader Zhang Xiruo, and Asanuma merely agreed, saying, "Well, yes..."
In 1960, when Suehiro Nishio and others left the JSP to form the Democratic Socialist Party, chairman Mosaburà  Suzuki resigned and Asanuma was elected his successor. In his role as JSP chairmain, Asanuma became one of the leading figures in the 1960 Anpo protests against the US-Japan Security Treaty. On 24 May 1960, he visited the U.S. Embassy to request postponement of President Dwight D. Eisenhower's planned visit to Japan and engaged in a heated debate with the ambassador over "American imperialism". In the face of massive, nationwide popular protests, Prime Minister Nobusuke Kishi was forced to resign and Eisenhower's visit was cancelled, although the Security Treaty was not scrapped.
In July 1960, shortly after the end of the Anpo protests, Prime Minister Nobusuke Kishi was stabbed six times in the left thigh by right-wing activist Taisuke Aramaki at the Prime Minister's Official Residence, sustaining serious but non-fatal injuries. Despite their intense political rivalry, Asanuma personally visited Kishi in the hospital to offer condolences and inquire about his condition.
As a politician, Asanuma cultivated an "everyman" image. He lived modestly in public housing his entire life, and was particularly popular among ordinary laborers, small shopkeepers, and other members of the working class.
In contrast to his pro-war stance during World War II, in the postwar period, Asanuma spearheaded the JSP's staunch opposition to revising Article 9 of Japan's postwar constitution and remilitarizing Japan. However, historian Andrew Gordon argues that Asanuma was consistent in his antipathy to western imperialism and a desire for Asia to chart its own course in world affairs.
On 12 October 1960, Asanuma was assassinated by 17-year-old Otoya Yamaguchi, a right-wing ultranationalist, during a televised political debate ahead of upcoming elections for the House of Representatives. While Asanuma spoke from the lectern at Tokyo's Hibiya Hall, Yamaguchi rushed onstage and ran his yoroi-dà Âshi, a traditional samurai short sword, through Asanuma's ribs on the left side, fatally wounding him. Japanese public broadcaster NHK was videorecording the debate for later transmission and the tape of Asanuma's assassination was shown many times to millions of viewers. The photograph of Asanuma's assassination won its photographer Yasushi Nagao both the Pulitzer Prize and World Press Photo of the Year.
On 17 October 1960, an imperial envoy visited Asanuma's home in Kà Âtà  Ward's Shirakawa Town to deliver a sacrificial offering (saishiryà Â) from Emperor Hirohito.
Yamaguchi was captured at the scene of the crime, and a few weeks afterwards committed suicide by hanging himself while in police custody.
Asanuma's assassination shocked Japan's political establishment. Shortly after his death, conservative prime minister and erstwhile electoral rival Hayato Ikeda captured the mood of his fellow lawmakers when he gave a heartfelt eulogy for Asanuma on the floor of the Diet. Commemorating Asanuma as a , Ikeda declared:
According to reportage at the time, Ikeda's short speech was met with thunderous applause and left many lawmakers in tears.
On 18 October 1960, Emperor Hirohito publicly appealed for public order and obedience to the law. In a speech opening a special session of the National Diet, the emperor urged the Japanese people to "esteem the principle of obeying the laws" and to "shun violence", remarks widely understood as alluding to the killing of Asanuma and the unrest that followed. Contemporary observers described the address as the emperor's closest approach to intervening in a matter of grave national political concern since his renunciation of divinity in 1946.
The site of his birthplace in Kamitsuki, Miyake Village, Miyakejima, has been turned into a public park (commonly called Children's Park), where a statue of Asanuma with his right arm raised was erected. However, following the eruption of Mount Oyama in 2000, toxic gases caused discoloration of the upper part of the statue. The park itself became overgrown with weeds and poorly maintained.
The Social Democratic Party had a bust of Asanuma in its headquarters, but when the party moved from the Social Cultural Hall to a private building in January 2013, the bust (weighing 2 tons) could not be moved without risking structural damage to the building. The base was cut down and some materials replaced to reduce the weight to 470 kg, and the relocation was completed in May 2013.
Asanuma lived for about 30 years in an apartment in the Dà Âjunkai residence in Shirakawa, Kà Âtà  Ward, Tokyo. When at home, he liked to tend plants in a tiny garden in the corner of the residence, barely larger than a "cat's forehead."
Before entering Waseda University, Asanuma failed entrance exams to military schools several times: twice for the Army Cadet School, twice for the Army Academy, and four times for the Naval Academy.
As a Waseda University student around 1921, when a typhoon flooded the rowing club's boathouse, Asanuma rushed to the scene and tried to save the boats, placing himself in the front line.
The meeting with his future wife, Kyà Âko, dates back to the end of the Taishà  era, during the transition to the Shà Âwa era. At that time, Asanuma and other socialist militants used the café where she worked as a gathering place. After their marriage, Asanuma was known both as a henpecked husband and as a deeply devoted spouse.
Asanuma was also known as a great dog lover, and many episodes relate to this. He participated as a voice actor in a radio drama adaptation of the Disney animated film Lady and the Tramp, recorded on 6 September 1956, in a Radio Tokyo studio in Yurakuchà Â, where he lent his voice to the bulldog role. When one of his previous dogs died, political rivals Kenji Fukunaga (Liberal Democratic Party) and Ikkà  Kasuga (Democratic Socialist Party) offered him an Akita puppy to comfort him. Named "Jirà Â", the Akita apparently sensed that its master was gone for good and stopped eating after Asanuma's assassination, dying shortly afterward, "as if it had followed its master". Asanuma is seen strolling with the grown Jirà  in Tokyo on 26 March 1960 (the day after his election as JSP chairman), in archival photos.
Asanuma was also known for his deep respect for Emperor Hirohito and the imperial family. He maintained a household Shinto altar (kamidana) in his apartment living room and performed a daily clapping reverence toward it every morning as a gesture of devotion. This practice stood in contrast to the Japanese Communist Party's calls to "overthrow the emperor system", which Asanuma reportedly disliked and rejected despite his socialist affiliations.
He once violently reprimanded a journalist who had made mocking remarks about the Emperor during an informal conversation.This episode has been cited as evidence of his understanding of Japan's national polity and his "patriot" qualities within socialism.Asanuma's respect for the emperor aligned with some right-leaning socialists' views, seeing the imperial institution as a symbol of national unity and ethnic harmony rather than oppression (unlike foreign monarchies). He reportedly viewed the emperor system as non-exploitative and capable of fostering social equilibrium, reflecting a "natural national sentiment" beyond ideological theory. This contributed to his divergence from radical communist anti-imperialism. As a right-wing Socialist Party secretary-general, Asanuma stated that the issue of the emperor's abdication should be decided by the emperor himself, demonstrating deference to imperial autonomy on sensitive postwar matters.
He also demonstrated great mediation skills outside his own party. Although classified on the right of the Socialist Party, he actively worked for cooperation between socialists and communists. He enjoyed strong trust among members and supporters of the Japanese Communist Party and contributed to maintaining good relations between the two parties.
His popularity in Tokyo's downtown working-class neighborhoods was particularly high. An oral tradition reports that a journalist who spoke negatively about him in a cafeteria frequented by local workers was immediately thrown out.
In keeping with his imposing stature, his appetite was exceptionally renowned. According to Shigezà  Hayasaka, then a journalist at the Tokyo Times, during an electoral tour, twice as many katsudon bowls as journalists were prepared. When a reporter asked: "Numa-san, are others coming?", Asanuma, already in his sixties, replied: "What? One is enough for you?", before devouring two bowls of katsudon without hesitation, accompanied by miso soup and pickled vegetables.
Passionate about combat sports, Asanuma was vice-captain of the sumo club during his years at Waseda University. He maintained close ties with the professional sumo world, actively supporting the wrestler à Âuchiyama Heikichi, and became in 1957 a member of the newly established deliberation committee of the Japan Sumo Association. Through this, he befriended Rikidà Âzan, the father of Japanese professional wrestling. Notably, he was also a blood relative of Yoshio Shirai, Japan's first professional boxing world champion, and acted as a witness at Shirai's wedding.
Although his assassin, Otoya Yamaguchi, was influenced by the doctrine of the religious movement Seichà  no Ie, particularly through founder Masaharu Taniguchi's writings such as Tennà  Zettai-ron to Sono Eikyà  (Absolute Theory of the Emperor and Its Influence), which Yamaguchi credited in his interrogation records with helping him overcome personal hesitation and embrace selfless loyalty to commit the act;Asanuma himself supported the founder of this movement.Taniguchi affirmed that Seichà  no Ie was neither opposed to the Socialist Party nor aligned with the Liberal Democratic Party.
Bin Akao had known Asanuma personally since their time on Miyakejima and once described him as "a good person, which makes it regrettable to deal with him" (Ã¥ÂÂ人ã ãÂÂãÂÂå§Âæ«ã«æªãÂÂ), a comment some sources suggest influenced Yamaguchi's motives alongside Asanuma's statement labeling American imperialism as the common enemy of Japan and China (as recorded in Yamaguchi's "Memorial of Severing the Traitor"). After the assassination, Akao telephoned Asanuma's wife Kyà Âko and Mutsuko Miki to express condolences or discuss the matter.
Following Asanuma's assassination, protest rallies and demonstrations condemning the outrage were held nationwide, with an estimated 445,000 participants in the rallies and 370,000 in the demonstrations.
Many members of the press were captivated by Asanuma, and it is said that every year on the anniversary of his death, journalists connected to him would gather to mourn his passing. In his lifetime, newspaper reporters would say, "When there's no political gossip material available, just look for Asanuma," and he would calmly accommodate even unreasonable requests such as "Please take a bath five times a day."
Michio Asanuma, who served as a member of the Suginami Ward Assembly before becoming a participant (advisor) in the Greater Japan Patriotic Party, was a distant relative of Inejiro Asanuma. In a 1990 appearance on the Fuji Television documentary program NONFIX episode "Heisei Right Wing Standing at the Turning Point" (as supreme advisor of the Greater Japan Patriotic Party), he spoke positively and with admiration about the character and actions of Otoya Yamaguchi, the assassin of his distant relative.
Former JSP chairman and future Prime Minister Tomiichi Murayama declared of Asanuma that he was a "great figure", adding that his decision to devote his political life to the Socialist Party was born from his meeting with him.
The Japan Socialist Party had been a union between left socialists, centrist socialists, and right socialists, who had been forced together in order to oppose the consolidation of conservative parties into the Liberal Democratic Party in 1955. Asanuma had been able to hold many of these mutually antagonistic factions together, and under Asanuma's charismatic leadership, the party had won an increasing amount of seats in the Diet in every election over the latter half of the 1950s and seemed to be gathering momentum.
Asanuma's death deprived the party of his leadership, and thrust Saburà  Eda into the leadership role instead. A centrist, Eda rapidly took the party in a more centrist direction, far faster than the left socialists were ready to accept. This led to growing infighting within the party, and damaged its ability to present a cohesive message to the public. Over the rest of the 1960s and going forward, the number of seats the Socialists held in the Diet continued to decline until the party's extinction in 1996.
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