WEB4 January 2022. (2022-01-04) (aged 83) Political party. Democratic Party. Alma mater. Tokai University. Keishu Tanaka (田中 慶秋, Tanaka Keishū, 6 March 1938 – 4 January 2022) was a Japanese politician, who served in the House of Representatives in the Diet (national legislature) as a member of the Democratic Party.