From the katteguchi, which serves as both sadoguchi (entrance for making tea) and kyujiguchi (apprentice's doorway), a wall extends obliquely along the traffic line of the service, and a triangle board called 'urokoita' is placed on the doorway.
茶道口と給仕口を兼ねるこの勝手口からは給仕の動線に沿って斜行する壁を立て足元には三角形の板畳「鱗板（うろこいた）」を敷く。