Satoshi Matsui was a soccer player at Seijo High School until he turned to basketball at the age of 16. He advanced to the Faculty of Economics at Kyoto Imperial University and was selected for the Japanese team at the 1934 Far Eastern Games and the 1936 Berlin Olympics. After graduation Matsui joined the Kobe Bachelor’s Club and continued to play high level basketball (Championships in 1948 and 1949). After his active career, he served as director and vice chairman of the Japan Basketball Association and as member of the Japanese Olympic Committee. Mitsui was also involved in organizing the 1979 Universiade.