The divine mirror, which was modeled after Yata no Kagami (the eight-span mirror; one of the Imperial regalia) as one of the three sacred imperial treasures, was kept in Unmeiden (Naishidokoro), therefore, court ladies in Naishi no tsukasa had to protect and keep the mirror.
三種の神器のひとつ・八咫鏡を模した神鏡が温明殿（内侍所）に安置されており、この神鏡を守護捧持するのも内侍司の女官の役目である。