In this research, in order to clarify the condition of bathroom planning required for severely disabled persons who need full assistance, the assistance actions of caretakers were recorded with a 3D motion capture system. At the same time, caretakers were interviewed about problems in assisting actions. Based on these results, improved bathroom layouts were created, and the assistance actions of caretakers were recorded again and analyzed. As a result, in the improved layouts, rotation action and moving distance were reduced. Finally, we proposed the size of the bathroom which was required for bathing of the severely disabled person.
