Nakamoto was born in Hiroshima Prefecture on October 29, 1959.
After graduating from Chuo University, he joined Nippon Kokan (later NKK) in 1982.
In August 1979, when Nakamoto was a Chuo University student, he was selected Japan U-20 national team for 1979 World Youth Championship.
In September 1987, he was selected Japan national team for 1988 Summer Olympics qualification.
This biographical article related to a Japanese association football defender born in the 1950s is a stub.