Kamamoto was born in Kyoto on April 15, 1944. After graduating from Waseda University, he joined Japan Soccer League club Yanmar Diesel in 1967. He played all games in league from first season. In 1968, he became a top scorer in the league. The club won their 1st title 1968 Emperor's Cup with his winning goal in final. The club also won 1970 Emperor's Cup. In 1971, the club won their 1st league champions and he also became a top scorer Second time. In 1974 and 1975, the club won the league for 2 years in a row and also won 1974 Emperor's Cup. In 1978, he became a playing manager. The club won the league champions in 1980. In 1982, he ruptured his Achilles tendon 2 times. In 1984, when he was 40 years old, he retired and resigned a manager. He became a top scorer 7 times and was selected Best Eleven 14 times. He was also selected "Japanese Footballer of the Year" awards 7 times.