Japan first participated in the Little League World Series in 1962. Between 1962 and 2000, Japan participated in the Far East Region of the LLWS. In 2001, the Far East Region was divided into the Asia Region and the Pacific Region. From 2001 to 2006, Japan competed in the Asia Region. In 2007, the Japan Region was created, so that the winner of the Japanese championship receives an automatic berth in the Series.
In 1967, the first All-Japan championship took place. Prior to 1967, Japanese teams participated in the Far East region in each year between 1962 and 1966. In 1969, the Far East Region conducted its first regional tournament, with teams from six nations. Kazuo Hayashi founded Little League Japan in 1964. His West Tokyo team was the very first Japanese team to win the Little League World Series, doing so in 1967. https://www.baseballjapan.org/system/prog/news.php?l=e&i=793
As of the 2025 Little League World Series.