Perception-assist automatically modifies the user's motion when the power-assist robot detected the possibility of collision between the user and some obstacles in the moving direction of the user. It can be useful function for elderly persons' daily motion assist. However, since unintentional motion is generated by the robot, the user sometimes feels discomfort. In this paper, a new perception assist method is investigated to solve this problem. When vibration is added to tendon of antagonist muscle around a joint, kinesthetic illusion is generated and subjects feel as if their antagonist muscle is expanded and joint is rotated. Controlling the user's joint motion might be possible using kinesthetic illusion by applying vibration to the tendon. In previous studies about kinesthetic illusion, there are no studies adapting kinesthetic illusion to continuous movement such as elbow flexion extension motion. In this study, vibration is added to biceps brachii during only once movement and continuous movement. Some features of kinesthetic illusion were obtained during continuous movement.