Kobuchi Kentarou (小渕健太郎) is a Japanese singer, guitarist, lyricist and composer. He is one of the two members and the main composer of Kobukuro.
- Name: Kobuchi Kentarou (小渕健太郎)
- Nicknames: Kobii, Shunin, Kenbou, Kobi-chan
- Birthdate: March 13, 1977
- Birthplace: Miyazaki, Miyazaki Prefecture, Japan
- Blood Type: O
- Height: 168cm
- Family: Wife, daughter and son (fraternal twins, born 2008.12.09)
-  mitsuki - Taisetsu na Mono (Chorus)
- [2009.02.18] Hotei Tomoyasu - GUITARHYTHM V (#6 Kaze no Ginga e)
-  Watanabe Misato - "YOU ~Atarashii Basho~" included on the single "YOU ~Atarashii Basho~ / Hana ~Kono Boku de Ikite Yuku~". (Lyrics and Music)
-  Watanabe Misato - "MUSIC FLOWER" included on the album Sing and Roses ~Uta to Bara no Hibi~. (Lyrics and Music)
-  Yano Maki - "Daisuki Datta n' da yo" included on the album Ii Kaze. (Lyrics and Music)
-  Natsukawa Rimi - "Sayounara Arigatou" included on the single of the same name. (Lyrics and Music) (Re-recorded in 2006 on the single "Sayounara Arigatou ~Ama no Kaze~ / Mirai")
-  Takenaka Eri - "Sayonara Sayonara" included on the single "Sayonara Sayonara / gerbera" (Sound Producer)
-  Matsuura Yoshihiro - "Hey Hey What do ya say?" included on the album Slidin'&Slippin'. (Guitar Chorus)
-  Ohno Minoru - "Nakitai Anata e]" (Lyrics)
-  Baba Toshihide - "Start Line ~ Atarashii Kaze" included on the single "Start Line 4SONGS". (Sound Producer)
-  mitsuki - "Taisetsu na Mono" single. (Lyrics, Music, Production, Guitar, and Chorus)
- He began playing the guitar because he was fan of the guitarist Okuda Tamio, member of UNICORN.
- He was 18 when his mother died. The song "Tooku de.." included on Kobukuro's first indie album, Saturday 8:pm was inspired by her death. Years later Kobuchi composed the song "Tsubomi", also inspired by her death.
- He worked as termite exterminator after he finish high school.
- He is commonly known as "Kobukuro's smaller one" (コブクロの小さいほう) .
- He is good at drawing. He has designed some of Kobukuro's covers and tour goods.
- He is a fan of Mr.Children and BUMP OF CHICKEN.