was a Japanese footballer. He played for the Japan national team. His brother Nobuo Matsunaga and Seki Matsunaga also played for the Japan national team.
In 1936, when he was a Tokyo Liberal Arts and Science University student, he was selected Japan national team for 1936 Summer Olympics in Berlin. At this competition, on 4 August, he debuted and scored a goal against Sweden. Japan completed a come-from-behind victory against Sweden. The first victory in Olympics for the Japan and the historic victory over one of the powerhouses became later known as "Miracle of Berlin" () in Japan. In 2016, this team was selected Japan Football Hall of Fame. On 7 August, he also played against Italy. He played 2 games and scored 1 goal for Japan in 1936.
In 1937, Matsunaga entered the Imperial Japanese Army and served in World War II with the 230th Infantry Regiment as a lieutenant. On 20 January 1943, he was killed in action during the Guadalcanal Campaign at the age of 28.