This study aims at revealing the name, directions and its changes of the Tenjo-no-ma. The results show mainly the following points.
1. It's recognized that Tenjo-no-ma is the space where respected to the user's status and the rule of the Tenjo-no-ma's spatial order, the establishment of manners and directions are also the characteristics of the Tenjo-no-ma.
2. During the Emperor Uda and Murakami's era, the Emperor sometimes appeared on the Tenjo-no-ma with tenjobito.
The Emperor Enyu hadn't appeared on the Tenjo-no-ma, and the Tenjo-no-ma's directions had been changed in this period.
3. Since the Emperor Uda's era, the waiting place in Imperial Palace for tenjobito, which was called Saburaidokoro by the Emperor, and Saburaidokoro, Saburai, Tenjo-no-saburai and Tenjo by the senior officers, assumed to follow the name process as Saburai, Saburaidokoro → Tenjo-no-saburai → Tenjo → Tenjo-no-ma.
