In the early eighth century, in accordance with Taiho Ritsuryo Code and Yoro Ritsuryo Code, the office organizations, as described below, after the establishment of the government-regulated ritsuryo system (Taiho Ritsuryo Code), were developed and official titles of all the officials were established.
8世紀前半、大宝律令・養老律令により日本の官制律令制（大宝律令）以後以下の職制が整備され、百官の職名が制定されていった。