Kazuyuki Sekiguchi (関口 和之 Sekiguchi Kazuyuki, born December 21, 1955 in Niigata Prefecture) plays the bass guitar for Southern All Stars. As a solo artist, he has played ukulele; he is a fan of Hawaiian music. For nearly twenty years, Sekiguchi has worked with Akira Sakuma in the Momotaro Dentetsu video game series as a music producer.
Kazuyuki Sekiguchi featuring Leyona
Kazuyuki Sekiguchi featuring KONISHIKI
- Watashi-no Aozora ~MY BLUE HEAVEN~ (私の青空 ～MY BLUE HEAVEN～ 'My Blue Sky ~MY BLUE HEAVEN~' 2002)
- Sakin (砂金 'Gold dust' 1986)
Captain Mook and The Ala Moana Strings
Featuring Petty Booka.
Kazuyuki Sekiguchi featuring Naoto Takenaka
- Kuchibue to Ukulele (口笛とウクレレ 'Whistle and Ukulele' 2000)
Kazuyuki Sekiguchi and Sazan All Stars
- World Hits!? of Southern All Stars (2001)