After graduating from Osaka University of Commerce, he joined Nippon Kokan (later NKK SC) in 1987.

The club won the 2nd place at 1987–88 Japan Soccer League and the champions at 1987 JSL Cup.

On 27 January 1988, Mochizuki debuted for Japan national team against United Arab Emirates.

On 20 February 2024, Mochizuki was appointed as the new Indonesia women's national football team coach.

This biographical article related to a Japanese association football midfielder born in the 1960s is a stub.