Niwa clan
was the 8th Niwa "daimyō" of Nihonmatsu Domain, and 9th 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 Nagayoshi by a concubine. He was received in formal audience by Shōgun Tokugawa Ienari in 1792, and became "daimyō" in 1796 on the death of his father. He was married to a daughter of Arima Yoritaka of Kurume Domain. He died in 1813 and his grave is at the temple of Dairin-ji in Nihonmatsu.