On April 11, 1868, the authority of Dajokan (Grand Council of State) was divided into legislative, executive and judicial branches, and each of them was led by Giseikan (an official to take charge of legislation), Gyoseikan (an official to take charge of administration) and Keihokan (an official to take charge of criminal justice), respectively.
慶応4年閏4月21日（1868年6月11日）、太政官の権力を立法・行法・司法の三権に分け、それぞれ議政官・行政官・刑法官に担当させることなどを定めた政体書を出した。