Ryutaro Hashimoto
Some of the prominent Keio alumni include: Japanese Prime Ministers Junichiro Koizumi (2001–2006), Ryutaro Hashimoto (1996–1998), and Tsuyoshi Inukai (1931–1932). Dozens of other alumni have been cabinet members and governors in the post-war period. Its alumni include 230 CEOs of major companies and 97 CEOs of foreign affiliated companies (both highest in Japan). Keio has over 320,000 alumni in 866 alumni associations.