After that, in December 1917 he simultaneously assumed office as director general of Imperial Museum (present Tokyo National Museum) and Head of Books of the Zushoryo (Bureau of Drawings and Books) and Kunaisho (Ministry of the Sovereign's Household), then Goyogakari of Council for the Imperial House System in January of the following year.
その後、1917年（大正7年）12月、帝室博物館（現東京国立博物館）総長兼図書寮宮内省図書頭（ずしょのかみ）に、翌年1月に帝室制度審議会御用掛に就任した。