Otodo (minister) ("Seikyuki" (exemplary book on Heian rituals)) or Sekkan (regents and advisers) ("Shokugensho" (history of government services)) were appointed to betto, the head of Naijudokoro (according to "Shoyuki" (the diary of FUJIWARA no Sanesuke), Sadaijin (Minister of the Left) Minamoto no Hikaru (courtier) was appointed to this post in 909 for the first time).
内豎所の長である別当には大臣（『西宮記』）・摂関（『職源鈔』）が充てられていた（『小右記』によれば初任は延喜9年（909年）に左大臣源光(公卿)が任じられた例であるという）。