Aristocrats served as 'betto' to administer the institution and in many cases the post was under the control of 'ryo' (bureau), and only Naizen no tsukasa (Imperial Table Office) other than Okimi no tsukasa had the position of 'betto' among others.
別当は貴族がつとめその機関を総裁する職で寮に置かれることが多く､司では他に内膳司にしか置かれていない。