A holding member can be made to move up and down with long strokes by means of short vertical strokes so that the overall arrangement can be downsized and lightweight. Additionally, the holding member can be held to a constant attitude and the overall arrangement can be simplified to reduce the cost. A swing arm is adapted to be swung between the metal mold of a resin molding machine and the outside of the resin molding machine by means of a rotary shaft rotating in response to a vertical motion of an elevating body relative to a vertical frame and, at the same time, a fitting member is adapted to be driven to rotate in response to the swinging motion of the swing arm in order to control the attitude of a vertical arm so as to make its axial line aligned with the vertical direction.