In 1967, Ninomiya played for
Mitsubishi Motors, he became a playing manager as
Tomohiko Ikoma successor and managed until 1975. In 9 seasons, the club won the champions 2 times (
1969 and
1973) and 2nd place 4 times. The club also
1971 and
1973 Emperor's Cup. After
Japan national team failed to qualify for
1976 Summer Olympics in April 1976, Ninomiya became a manager for Japan national team as
Ken Naganuma's successor. Ninomiya managed at
1978 World Cup qualification and
1978 Asian Games. He resigned after 1978 Asian Games. In 2015, Ninomiya was selected
Japan Football Hall of Fame. ==National team statistics==