As the term "junishi (twelve offices)" suggests, the Kokyu junishi consisted of twelve offices including Naishi no tsukasa (Female Palace Attendants Office), Kura no tsukasa (Office concerned about clothes of Emperor and Empress), Fumi no tsukasa (Book and Writing Materials Office), Kusuri no tsukasa (Medical Office), Suwamono no tsukasa (Military Equipment Office), Mikado no tsukasa (Emperor Attendants Office), Tonomo no tsukasa (Housekeeping Branch of the Imperial Household Ministry), Kamori no tsukasa (Housekeeping Office), Mondo no tsukasa (Water Office), Kashiwade no tsukasa (Table Office), Sake no tsukasa (Sake Office) and Nui no tsukasa (Sewing Office).
「十二司」という名のとおり、内侍司・蔵司・書司・薬司・兵司・闡司・殿司・掃司・水司・膳司・酒司・縫司の12官司より構成されている。