Abstract
This paper describes the effectiveness of supporting chair which is known as one type of welfare device. Their effectiveness was clarified by doing the following evaluations. Firstly, there was a subjective investigation for using senior persons. This was done for the purpose of checking their feeling in the time that they used the supporting chairs. And another was to measure the load on their lower limbs (ankles, knees, hips) when they stood up from them. This was calculated by modeling the body as the rigid one. From the results of this study, it was clear that supporting chairs decrease the load on lower limbs during standing-up motion very well. And the study also found that supporting chair has problems during their support action.
