Electrode for resistance spot welding

A resistance spot welding method comprising:

• holding a plurality of metal plate materials superimposed on one another along a plate thickness direction of the metal plate materials by electrodes for resistance spot welding;
• and
• joining the metal plate materials to one another through energizing the electrodes, wherein
• each of the electrodes includes an electrode tip portion configured to hold each of the metal plate materials being provided with a projection portion and a plurality of recess portions,
• the plurality of the recess portions, which are independent of one another, are provided in the electrode tip portion in a dispersed manner,
• the projection portion is a region other than regions where the recess portions are provided, and is configured to be equipped with a continuous surface that continues in regions among the plurality of the recess portions without being divided by the recess portions, and
• the projection portion contacts with a film present on surfaces of the metal plate materials in holding a plurality of metal plate materials superimposed on one another along a plate thickness direction of the metal plate materials by the electrodes.