During the era of Emperor Ninmyo, after serving as Kura no kami (Chief of Kuraryo, Bureau of Palace Storehouses), Kudai-taifu (a post of Imperial Household Ministry), Hyobu taiyu (Senior Assistant Minister of the Hyobusho, Ministry of Military) and Danjo-daihitsu (Senior Assistant President of the Board of Censors), Sadanushi was appointed as Shikibu no taifu (Senior Assistant Minister of the Ministry of Ceremonial), holding the concurrent posts of Okura-kyo (Minister of the Treasury) with the court rank being Jushiinojo (Junior Fourth Rank, Upper Grade) and Sanuki no kami (the governor of Sanuki Province).
仁明天皇の時に内蔵頭・宮内大輔・兵部大輔・弾正大弼をへて従四位上の大蔵卿に讃岐守を兼ね、式部大輔となる。