WELDING JIG DEVICE AND PRODUCTION METHOD FOR COMPONENT

To facilitate a welding operation. A welding jig device (1) is used for forming a part by welding a plurality of members (W) together, and includes a jig (10) on one side having a joint face on one side, which is adapted to contact one of faces exposed on the outer surface sides of the plurality of members (W) overlaid one on top of the other, and an opening on one side corresponding to a portion of desired welded portions of a part (5); and a jig (20) on another side having a joint face on the other side, which is adapted to contact another face of the faces exposed on the outer surface sides of the plurality of members W, and an opening on the other side corresponding to another portion of the desired welded portions of the part (5) and not corresponding to the opening on the one side.