Any Imperial property (that is, items privately owned by the Imperial house) or other cultural assets under the purview of the Imperial Household Agency (like those in the Imperial Household Archives, the Museum of the Imperial Collections, in their Kyoto Office, or in the Shosoin Office of the Imperial Household Agency) are excluded, under the Law for the Protection of Cultural Properties, from consideration and cannot be designated national treasures, important cultural properties, historical landmarks, or special historical landmarks.
御物（ぎょぶつ、皇室の私有品）および宮内庁（書陵部、三の丸尚蔵館、京都事務所、正倉院事務所）管理の文化財は文化財保護法による国宝、重要文化財、史跡、特別史跡等の指定の対象外となっている。