Nihonmatsu Domain
was the 5th Niwa "daimyō" of Nihonmatsu Domain, and 6th hereditary chieftain of the Niwa clan. His courtesy title was "Saikyō-no-daifu", and his Court rank was Junior Fourth Rank, Lower Grade. He was a "hatamoto" descendant of the sixth son of Niwa Nagahide and was posthumously adopted by the childless Niwa Hidenobu to become "daimyō" in 1728. He was received in formal audience by Sh Jijū gun Tokugawa Yoshimune the same year. His wife was a daughter of Niwa Nagayuki. He retired in 1745 due to illness. He died in 1769. His grave is at the temple of Dairin-ji in Nihonmatsu.