After graduating from the University of Tsukuba, he joined Urawa Reds in 1992.
In 1993, he returned to Urawa Reds and played many matches as a forward.
In 1994, he did not make any appearances and so he moved to Regional Leagues club Prima Ham Tsuchiura (later Mito HollyHock).
After retirement, Ninomiya started his coaching career at Mito HollyHock in 1998.
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