A vehicle body manufacturing apparatus includes: a jig that holds one work of the vehicle body, positions the one work to the another work, and joins the works together at a joint section; a welding gun that welds a weld portion in the joint section by an electrode that is moved along a pressure axis and pressed against the weld portion; and a welding position fixing member that regulates the pressure axis, along which the electrode is moved, within a setting area, the welding position fixing member being movable in a coaxial direction to the pressure axis along which the electrode is moved, being contactable with the joint section to interpose the joint section between the jig and the welding position fixing member, and having a controllable pressure at a time of welding the weld portion by the electrode, which is moved at the time of welding.

The present disclosure provides a method of resistance spot welding that can inhibit Liquid Metal Embrittlement-induced cracking in zinc-coated steel plates irrespective of the degrees of tensile strength. One aspect of the present disclosure provides a method of resistance spot welding. The method comprises welding a workpiece with a resistance spot welding apparatus. The workpiece includes two or more steel plates in an overlapping state. The two or more steel plates include at least one steel plate coated with zinc. The welding includes welding while compressing a high-tensile steel plate among the two or more steel plates in a direction intersecting a direction of a thickness of the high-tensile steel plate. The high-tensile steel plate has a tensile strength higher than a tensile strength of another steel plate among the two or more steel plates.