After graduating from Juntendo University, he joined new club Shimizu S-Pulse based in his local in 1992.
He became a regular player as left side back and the club won the 2nd place 1992 and 1993 J.League Cup.
In 1996, he moved to the Japan Football League (JFL) club Consadole Sapporo.
After retirement, Hiraoka started coaching career for Albirex Niigata in 1999.
This biographical article related to a Japanese association football defender born in the 1960s is a stub.