Shisho were originally placed in some offices such as Daijokan, Jingikan, the eight ministries, Shuzeiryo, and Shukeiryo; however, as the administration became complicated, Shisho were additionally placed in other offices.
もともとは太政官・神祇官や八省および主税寮・主計寮など一部の官司にしか置かれていなかったが､行政の煩雑化に伴って様々な官司へ増置された。