A resistance spot welding method is provided, which allows a large nugget to be formed while the occurrence of expulsion is prevented. The resistance spot welding device according to the present invention is a resistance spot welding device for welding at least two overlapping steel sheets held between a pair of welding electrodes. The resistance spot welding device includes the pair of electrodes, an electrode force gauge that measures an electrode force, and a controller that controls an electric current supply to the electrodes according to the electrode force measured by the electrode force gauge. The controller controls the electric current such that the electrode force F measured by the electrode force gauge after the start of the electric current supply is adjusted to a prescribed value.