The purpose of this study is to develop a wearable power assisting orthosis for nursing care. This orthosis targets at hold support within various nursing care. During hold support, care person uses both hands. That's why it's necessary for us to develop the hands-free control system In this paper, first, we analyzed hold support to realize the hands-free control system which use the electromyogram and the joint angle as control signal. From the result of analysis, we selected the electromyogram on supraspinatus muscle as a suitable control signal which applied a actuator. At the same time, selected the angle on elbow joint as a suitable control signal which stopped a actuator. By using these two signals, we realized the hands-free control system. At last, we ran the evaluation experiment to verify the effectiveness of the orthosis for hold support. From this result, it was confirmed.