The central government office including Chodo-in (an office at the Heijo-kyo Palace), the center of affairs of state, was built side by side with Dairi, and the complex was collectively called Kyujo.
国政の中枢である朝堂院をはじめとする中央官衙は内裏に併設され、合わせて宮城と呼ばれる。