Nihonmatsu Domain
was the 3rd Niwa "daimyō" of Nihonmatsu Domain, and 4th hereditary chieftain of the Niwa clan. His courtesy title was "Echizen-no-kami", and his Court rank was Junior Fifth Rank, Lower Grade. He was the younger brother of Niwa Nagatsugu, and was received in formal audience by Shōgun Tokugawa Tsunayoshi in 1684. He became "daimyō" in 1692 on the death of his brother. He had a son and daughter by a concubine, but never took a formal wife. His grave is at the temple of Dairin-ji in Nihonmatsu.