Seiin (highest organ in the Daijokan organization system) was organized after the Haihan-chiken (abolition of feudal domains and establishment of prefectures), and after the political upheaval of the 6th year of Meiji, they concurrently served as the secretary of ministries.
廃藩置県後には正院を構成し、明治六年の政変以後は各省長官を兼任する。