is a retired Japanese judoka.
Koga is from Kokura, Fukuoka and began judo at the junior high school days. In 1961, When he was a student of Nihon University, was chosen to represent Japan in the World Championship held in Paris and got a bronze medal.
Koga began working for the Yawata Steel after graduation from university in 1962.
Koga also participated All-Japan Championships 8 times and won a bronze medal in 1965.
Achievements 1959 - All-Japan University Championships 2nd 1960 - All-Japan University Championships 3rd 1961 - World Championships (Openweight only) 3rd - All-Japan University Championships 1st 1965 - All-Japan Championships (Openweight only) 3rd
References