Left Benkan Office was responsible for the four ministries of Nakatsukasasho (Ministry of Central Affairs), Shikibusho (Ministry of Ceremonial), Jibusho (Ministry of Civil Administration), Minbusho (Ministry of Popular Affairs), and Right Benkan Office was responsible for the four ministries of Hyobusho (ministry of military), Gyobusho (Ministry of Justice), Okurasho (Ministry of Treasury), and Kunaisho (Imperial Household Ministry).
左弁官局が中務省・式部省・治部省・民部省の4省を、右弁官局が兵部省・刑部省・大蔵省・宮内省の4省を管轄する。