|Native name||国分 太一|
|Born||September 2, 1974|
|Origin||Higashikurume, Tokyo, Japan|
Taichi Kokubun was born in Higashikurume, Tokyo.
As an artist
Before debuting with Tokio, Kokubun, like other Tokio members, was a backup-dancer for Johnny's Entertainment boy bands, including Hikaru Genji. In 1990 he became the keyboardist of Tokio, but it was not until 1994 that the band debuted.
As an actor
Kokubun began his acting career with a role in Abunai Shōnen III, a 1989 Japanese drama. Since 1993, he has played parts in drama shows and movies such as Fantistipo and Shaberedomo Shaberedomo.
He has hosted Gachinko! with other Tokio members. Currently Kokubun hosts Kaitai Shin Show and Shonen Club Premium on NHK, Tetsuwan Dash and Guruguru Ninety-Nine on NTV, R30 on TBS, Mentore G on Fuji TV, and Aura no Izumi on TV Asahi.
|1989||Abunai Shōnen III||TV||Uncredited role|
|1994||Otōsan wa Shinpaisho||TV|
|Yagami-kun no Katei no Jijo||TV||Koji Yagami|
|1996||Glass no Kakeratachi||TV|
|1997||Kin no Tamago||TV|
|Kenshui Nanako||TV||Shinya Aramaki|
|Shin Oretachi no Tabi||TV||Episode 10 only|
|2000||Bus Stop||TV||Kyugo Abe|
|2001||Omae no Yukichi ga Naiteiru||TV|
|2004||Tokio||TV||Takumi Miyamoto||Lead role|
|2005||Hiroshima Showa 20 nen 8 Gatsu Muika||TV||Michaki Shigematsu|
|Fantistipo||Movie||Toraji||Starred with KinKi Kids member Tsuyoshi Domoto, whom he released the theme song to the movie with|
|2006||Dance Drill||TV||Wataru Ishibashi|
|2007||Inochi no Iro Enpitsu||TV||Lead role|
|Shaberedomo Shaberedomo||Movie||Mitsuba||Award a Mainichi Film Award for Best Actor|