Abstract: 1MS is a more advanced manufacturing system than FMS. However, 1MS do not have sufficient performance for the work in the various and uncertain environment , because of the difficulty of the work and occurrence of the unexpected condition ‘ If IMS is hard to work properly , teleoperation system can support it by using the human' s consideration and judgment. The master mechanism is a basic component of the teleoperation system and the development of the useful one is important for efficiency of the work. A master mechanism of exoskeleton type can increase the work efficiency , mobility, and harmony between a working robot and an operator. This paper describes an arm-harness of exoskeleton type , which is able to drive a robot according to judgment. This device is applied to a robot system for evaluating the system performance through the experiment