Left and right Emonfu's official duty was to guard the outer baileys of the kyujo (baileys that are outward the Kenshun Gate, Kenrei Gate, Gishu Gate, Sakuhei Gate of Daidairi (inside the palace), and those which are inward the Yomei Gate, Inpu Gate, Suzaku Gate, and Ikan Gate of Daidairi).
宮城外郭（大内裏のうち、建春門・建礼門・宜秋門・朔平門より外側で陽明門・殷富門・朱雀門・偉鑒門より内側）を警備することが職掌。