When Naoaki passed away in 1850, Naosuke took the reins of the family, becoming the 15th lord of the domain, and transferred to Kamon no Ryo (the Bureau of Palace Upkeep) (Kamon no Kami).
嘉永3年（1850年）、直亮の死去を受け家督を継いで第15代藩主となり、掃部寮（かもんのかみ）に遷任する。