After graduating from high school, he joined Sanfrecce Hiroshima in 1995.

He debuted in 1996 and became a regular striker as Takuya Takagi successor from 1998.

After 1998 World Cup, in October 1998, Kubo was selected Japan national team by new manager Philippe Troussier.

After 2002 World Cup, in December 2003, he was selected Japan for 2003 East Asian Football Championship and he scored 2 goals against China.

This biographical article related to a Japanese association football forward, born in the 1970s is a stub.