It presided over all the affairs related to military defense, such as personnel evaluation of military officers, conferment of a court rank, appointment to an office, supervision of eji (guards) in all provinces and administration of armaments.
内外の武官の人事考課、選叙（叙位及び任官）諸国の衛士の管理、武器の管理など、軍事防衛関連事項の一切を司る。