Although Tsuneosa was appointed to Ushoben (Minor Controller of the Right) in 1863 and Kurodo (Chamberlain) in 1864, he was dismissed from the government posts and placed under house arrest over the charge of the involvement of Kinmon Incident (Conspiracy of Kinmon) as the Kashuji family had been the Shisso family (the family which served as the intermediary between the Court and the Shogunate government) of the Mori clan.
文久3年（1863年）に右少弁、元治元年（1864年）に蔵人に任じられるが、勧修寺家が毛利氏の執奏家であったために禁門の変に座して官職を奪われて蟄居を命じられる。