After that, he cooperated in creating the Decree (of 1867) for the Restoration of Imperial Rule with Tomomi IWAKURA and was in charge of moderating at the Kogosho Conference (the meeting held in the presence of the Emperor in the Kogosho Conference Room of Kyoto Imperial Palace at the night of December 9, 1867, when the Decree for the Restoration of Imperial Rule was issued).
その後も岩倉具視らと協力して王政復古の大号令を実現させ、小御所会議では司会を務めた。