He is a skilful playmaker renowned for his passing and ball control, as well as his shooting with either foot.

FC Tokyo won the champions in 2004 J.League Cup first major title in the club history.

[3] In June 2005, Kajiyama was selected Japan U-20 national team for 2005 World Youth Championship.

At this tournament, he played 3 matches as defensive midfielder with Yuzo Kobayashi.

At this tournament, he wore the number 10 shirt for Japan and played all 3 matches as defensive midfielder.