After graduating, Kamamoto joined the
Japan Soccer League club
Yanmar Diesel in 1967 (currently known as Cerezo Osaka). He played all league games from his first season on. In 1968, he became the top scorer in the
Japan Soccer League. Yanmar Diesel won their 1st title, the
1968 Emperor's Cup, with Kamamoto's winning goal in the
final. The club also won the
1970 Emperor's Cup. In
1971, for the first time, the club became league champions and Kamamoto became the top scorer for a second time. Between
1974 and
1975, Yanmar Diesel won the league for two years in a row and also won the
1974 Emperor's Cup. In 1978, Kamamoto became a player manager. The club was league champions in
1980. In 1982, Kamamoto ruptured his
Achilles tendon twice and, in 1984, when he was 40 years old, he retired. All in all, Kamamoto was top scorer seven times and was selected in the best eleven fourteen times. He was also selected as Japanese Footballer of the Year seven times. == International career ==