| Koichi Sekimoto 関本 恒一 | |
| Fullname: | Koichi Sekimoto |
| Birth Date: | 23 May 1978 |
| Birth Place: | Osaka, Japan |
| Death Place: | Osaka, Japan |
| Position: | Defender |
| Youthyears1: | 1994–1996 |
| Youthclubs1: | Yokkaichi Chuo Technical High School |
| Years1: | 1997–2002 |
| Clubs1: | Sagan Tosu |
| Caps1: | 89 |
| Goals1: | 2 |
| Years2: | 2013–2014 |
| Clubs2: | FC Ise-Shima |
| Caps2: | 5 |
| Goals2: | 1 |
| Totalcaps: | 94 |
| Totalgoals: | 3 |
was a Japanese football player.
Sekimoto was born in Osaka Prefecture on May 23, 1978. After graduating from high school, he joined Japan Football League club Sagan Tosu in 1997. He played many matches from the first season and the club was promoted to the J2 League in 1999. He retired at the end of the 2002 season. In 2013, he returned to play for Prefectural Leagues club FC Ise-Shima. However, he was diagnosed with osteosarcoma in August 2014. On January 23, 2016, he died of leiomyosarcoma, a type of cancer in Osaka Prefecture at the age of 37.[1]
| Club performance | League | Cup | League Cup | Total | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Season | Club | League | Apps | Goals | Apps | Goals | Apps | Goals | Apps | Goals | |
| Japan | League | Emperor's Cup | J.League Cup | Total | |||||||
| 1997 | Sagan Tosu | Football League | 7 | 1 | 1 | 0 | 0 | 0 | 8 | 1 | |
| 1998 | 20 | 0 | 3 | 1 | colspan="2" | - | 23 | 1 | |||
| 1999 | J2 League | 10 | 0 | 0 | 0 | 1 | 0 | 11 | 0 | ||
| 2000 | 11 | 0 | 0 | 0 | 0 | 0 | 11 | 0 | |||
| 2001 | 25 | 1 | 4 | 0 | 2 | 0 | 31 | 1 | |||
| 2002 | 16 | 0 | 3 | 0 | colspan="2" | - | 19 | 0 | |||
| 2013 | FC Ise-Shima | Prefectural Leagues | 4 | 1 | colspan="2" | - | colspan="2" | - | 4 | 1 | |
| 2014 | 1 | 0 | colspan="2" | - | colspan="2" | - | 1 | 0 | |||
| Total | 94 | 3 | 11 | 1 | 3 | 0 | 108 | 4 | |||