Koichi Takemasa

Koichi Takemasa (武正 公一, Takemasa Kōichi; born 23 March 1961) is a Japanese politician who served in the House of Representatives in the Diet (national legislature) as a member of the Constitutional Democratic Party. A native of Shimizu, Shizuoka and graduate of Keio University he was elected for the first time in 1995 after an unsuccessful run in 1991.

ConstituencyPR block

Preceded byHikaru Matsunaga

Succeeded byMulti-member district

ConstituencySaitama 1st (2000–2012)
PR block (2012–2017)

Quick facts Constituency, Preceded by ...

Koichi Takemasa
武正 公一
Official portrait, 2009
Member of the House of Representatives from Northern Kanto
In office 1 November 2024 – 23 January 2026
Constituency	PR block
In office 26 June 2000 – 28 September 2017
Preceded by	Hikaru Matsunaga
Succeeded by	Multi-member district
Constituency	Saitama 1st (2000–2012) PR block (2012–2017)
Member of the Saitama Prefectural Assembly
In office 1995–2000
Constituency	South 3rd
Personal details
Born	(1961-03-23) 23 March 1961 (age 65) Shimizu, Shizuoka, Japan
Party	CRA (since 2026)
Other political affiliations	Independent (before 2000) DPJ (2000–2016) DP (2016–2017) KnT (2017–2018) CDP (2018–2026)
Alma mater	Keio University

Close