In October 1964, when Mori was a Waseda University student, he was selected the Japan national team for 1964 Summer Olympics in Tokyo. But he did not play in the match. On December 16, 1966, he debuted against Singapore at 1966 Asian Games. In 1968, he was selected Japan for 1968 Summer Olympics in Mexico City. He played in all matches and Japan won Bronze Medal. In 2018, this team was selected Japan Football Hall of Fame. In 1970, he also played at 1970 Asian Games. He played 56 games and scored 2 goals for Japan until 1976.