Oishi was born in Shizuoka Prefecture on November 26, 1979.
After graduating from Shizuoka Gakuen High School, he joined Japan Football League club Kawasaki Frontale in 1998.
Although he played many matches as midfielder, the club was relegated to J2 in a year.
In 2002, he moved to J2 club Ventforet Kofu on loan.
This biographical article related to a Japanese association football midfielder born in the 1970s is a stub.