It was composed of a consultative legislative organization including Daijo-daijin (grand minister of state), Sadaijin (minister of the left), Udaijin (minister of the right) and Dainagon (chief councilor of state), and its subordinates, namely, Shonagonkyoku (Lesser Counselors' Office) and Sayu Benkankyoku (the left Controllers' Office and the right Controllers' Office).
太政大臣・左大臣・右大臣と大納言などの合議体による議政官組織と、その下の少納言局・左右弁官局からなる。