This agency handles the routine functions of national affairs, office work of receiving of foreign ambassadors and ministers as an emperor's constitutional functions, affairs on Imperial family's ceremonies, and stores the gyoji (the imperial Seal) and the seal of state.
皇室関係の国家事務、天皇の国事行為にあたる外国の大使・公使の接受に関する事務、皇室の儀式に係る事務をつかさどり、御璽・国璽を保管する。