There is provided a spot welding apparatus. The spot welding apparatus includes a fixed electrode and a movable electrode that clamp and press a workpiece formed of stacked plates of different rigidities, and a control pressing force applicator that causes a control pressing force applying actuator to bring a receiving unit provided at a distal end of a control pressing force applying arm into contact with the workpiece so as to apply a control pressing force to the workpiece. The control pressing force applying arm is made of a non-magnetic material.