In 1853, he became a Giso (Court Councilor who valetted for the emperor and was in charge of reporting a decision made by Daijokan [Grand Council of State] to the emperor and conveying the emperor's command to the nobles), and thereafter he played an active part in supporting the emperor in a relationship between the imperial court and Edo shogunate, and in 1855 Naofusa attended to receive the transcripts of the Treaties of amity concluded with the United States, the United Kingdom and Russia, respectively.
嘉永6年（1853年）議奏となって以後、朝幕関係の朝廷に奔走する事となり、安政2年（1855年）アメリカ合衆国・イギリス・ロシアとの和親条約の謄本を受理する。