|Full name||Keisuke Tsuboi|
|Date of birth||16 September 1979|
|Place of birth||Tama, Tokyo, Japan|
|Height||1.79 m (5 ft 10 1⁄2 in)|
|Playing position||Centre back|
|2002–2014||Urawa Red Diamonds||292||(1)|
* Senior club appearances and goals counted for the domestic league only and correct as of 17 May 2018|
He was educated at and played for Yokkaichi Chūō Industrial High School and Fukuoka University. He represented Japan for the 2001 Universiade held in Beijing where the team won the title beating Ukraine in the final.
After graduating from the university in 2002, he joined Urawa Red Diamonds and immediately broke into the first team. His first appearance came on 3 March 2002 against Yokohama F. Marinos. He scored his first league goal on 17 May 2003 against Gamba Osaka. He won the J-League Young Player of the Year award in 2002 and was selected as one of the J. League Best Eleven in 2003.
Japan's national coach Zico gave him the first cap in 2003 when he played Tsuboi on 11 June 2003 in a friendly against Paraguay at Saitama Stadium. He was a member of the Japan team for 2006 FIFA World Cup where he played 2 games against Australia and Brazil. In Japan's first match against Australia, he suffered from cramps in his both thighs and had to be replaced by Teruyuki Moniwa in the 56th minute.
On 8 February 2008 he announced retirement from international football.
|Club||Season||League||Emperor's Cup||League Cup||Champions League||Other*||Total|
|Urawa Red Diamonds||2002||30||0||1||0||8||0||-||-||39||0|
|Japan national team|
Appearances in major competitions
|Japan||2003 FIFA Confederations Cup||Senior||3||0||0||Round 1|
|Japan||2005 FIFA Confederations Cup||Senior||0||0||0||Round 1|
|Japan||2006 FIFA World Cup qualification||Senior||3||0||0||Qualified|
|Japan||2006 FIFA World Cup||Senior||2||0||0||Round 1|
|Japan||2007 AFC Asian Cup qualification||Senior||3||0||0||Qualified|
- Urawa Red Diamonds
- Shonan Bellmare
- J2 League: 1
- "TSUBOI Keisuke". Japan National Football Team Database. Archived from the original on 22 September 2013.
- "Stats Centre: Keisuke Tsuboi Facts". Guardian.co.uk. Archived from the original on 1 October 2012. Retrieved 22 February 2010.
- "坪井 慶介：湘南ベルマーレ：Ｊリーグ.jp". jleague.jp. Retrieved 2016-10-03.
- "Tsuboi offered something different in Japan's defence". A View From A Brit by Jeremy Walker. 11 February 2008. Retrieved 28 December 2012.
- "坪井慶介 湘南ベルマーレへ完全移籍" (in Japanese). Urawa Red Diamonds. 14 December 2012. Retrieved 11 May 2018.
- Nippon Sports Kikaku Publishing inc./日本スポーツ企画出版社, "J1&J2&J3選手名鑑ハンディ版 2018 (NSK MOOK)", 7 February 2018, Japan, ISBN 978-4905411529 (p. 231 out of 289)
- Nippon Sports Kikaku Publishing inc./日本スポーツ企画出版社, "2016J1&J2&J3選手名鑑", 10 February 2016, Japan, ISBN 978-4905411338 (p. 69 out of 289)