Nihonmatsu Domain
was the 9th Niwa "daimyō" of Nihonmatsu Domain, and 10th 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 the eldest son of Niwa Nagaakira by a concubine. He became "daimyō" in 1813 on the death of his father and ruled Nihonmatsu Domain. He built a han school. He retired in 1858. He was married to a daughter of Arima Yorinao of Kurume Domain. He died in 1866 and his grave is at the temple of Dairin-ji in Nihonmatsu.