This study clarifies the actual situation about succession of Rikyu's idea and originality of modern Taian Utsushi. In Taian Usushi, the suitable designs for the modern tea ceremony in addition to the basic designs of Taian that succeed Rikyu's ideas are reproduced. And it is divided into the reproduction type, the type of valuing historical materials, and the restoration type. If a designer thinks Taian is based on Rikyu's idea, it becomes the reproduction type or the type of valuing historical materials. If a designer doesn't think Taian is based on Rikyu's idea so much, it becomes the restoration type.
