Funamoto was born in Hiroshima on August 12, 1942. After graduating from Hiroshima University High School, he joined his local club, Toyo Industries in 1961. In 1965, Toyo Industries joined new league Japan Soccer League. The club won league champions in 1965, 1966, 1967, 1968 and 1970. The club also won 1965, 1967 and 1969 Emperor's Cup. He retired in 1975. He played all 166 league matches in 11 seasons. He was selected Best Eleven in 1970.