Resistance welding method and resistance welding apparatus

A resistance welding apparatus, comprising:

• a welding system that welds a plurality of welding target members by supplying an electric current through electrodes;
• and
• a fragile portion generating system that generates a fragile portion in a position of the welding target members different from a position subject to the welding by using the electrodes for the welding or electrodes separate from the electrodes for the welding, before, during, or after the welding by the welding system is performed.