Ikoma was born in Hyogo Prefecture on August 25, 1932. When he was a Kwansei Gakuin University student, he won 1953 and 1955 Emperor's Cup as a member of All Kwangaku which was consisted of his alma mater Kwansei Gakuin University players and graduates. After graduating from university, he joined Mitsubishi Motors in 1955. In 1965, the club joined new league Japan Soccer League. However he did not play in the match in the league. In 1966, he became a playing manager. End of 1966 season, he resigned as manager and retired from playing career.