Nakamaro served as its head from the very beginning, but the post of Shibinaisho became vacant when Nakamaro was appointed to Oho (Udaijin (Minister of the Right) and became the top of the Daijokan in 758.
長官職は創設以来仲麻呂が務めていたが､758年に仲麻呂が大保（右大臣）に転じて太政官の首班となり、紫微内相が空位になった。