In May 1934, when Ukon was a Keio University student, he was selected the Japan national team for Far Eastern Championship Games in Manila. At this competition, on May 15, he debuted against Philippines. In 1936, he was also selected Japan for 1936 Summer Olympics in Berlin and scored a goal against Sweden. Japan completed a come-from-behind victory against Sweden. The first victory in Olympics for the Japan and the historic victory over one of the powerhouses became later known as "Miracle of Berlin" () in Japan. In 2016, this team was selected Japan Football Hall of Fame. He played 5 games and scored 1 goal for Japan until 1940.