Abstract
In this paper, we propose an assistance system for an old aged person to support his/her standing-up motion from a chair or a bed with inducing them to be a certain posture. We think the certain posture is the posture of tilting the body toward one side, because generally we are comfortable with our posture of using armrests or standing on one leg. First, we examine how much tilting body support load to the knee. Finally, we develop the mechanical system to moving one side of armrest and examine our system.