The scale of O-oku increased in later times, many posts were established and at the top of such posts were managers (umbrella administrator) like Joro Otoshiyori and Otoshiyori.
大奥は時代が下るにつれて規模が肥大化し、それに伴って数多くの役職が置かれていったが、その頂点に立つのが上臈御年寄や御年寄といった取締役（統括管理職）だった。