A resistance spot welding method of squeezing, by a pair of electrodes (4, 5), parts to be welded that are a plurality of overlapping metal sheets (11, 12, 13), and passing a current while applying an electrode force to join the parts to be welded, the resistance spot welding method comprising: setting an electrode force F A of main current passage after an intermediate welding time T a based on an average value or time integration value R A of a resistance between the electrodes (4, 5) from the start of the main current passage to the intermediate welding time T a, wherein the intermediate welding time T a satisfies the following formula: 0.1 × T m ≤ T a ≤ 0.8 × T m where T m is a total welding time of the main current passage, characterized in that the electrode force F A of the main current passage after the intermediate welding time T a is set so as to satisfy the following formulas to: - in the case of -0.1 ≤ (R A - R 0) / R 0 ≤ 0.1 0.9 × F 0 ≤ F A ≤ 1.1 × F 0 - in the case of (R A - R 0) / R 0 < -0.1 F 0 < F A < F 0 × 1 − 5.0 × R A − R 0 / R 0 - in the case of 0.1 < (R A - R 0) / R 0 F 0 × 1 − 5.0 × R A − R 0 / R 0 < F A < F 0 where F 0 is an initial set electrode force in the main current passage, R A is the average value or time integration value of the resistance between the electrodes from the start of the main current passage to the intermediate welding time T a, and R 0 is an average value or time integration value of a resistance between the electrodes from the start of current passage to the intermediate pressurizing time T a that is obtained in the case where current is passed under the same conditions as the main current passage in a state of no disturbance in the parts to be welded. setting an electrode force F A of main current passage after an intermediate welding time T a based on an average value or time integration value R A of a resistance between the electrodes (4, 5) from the start of the main current passage to the intermediate welding time T a, wherein the intermediate welding time T a satisfies the following formula: 0.1 × T m ≤ T a ≤ 0.8 × T m where T m is a total welding time of the main current passage, characterized in that the electrode force F A of the main current passage after the intermediate welding time T a is set so as to satisfy the following formulas to: - in the case of -0.1 ≤ (R A - R 0) / R 0 ≤ 0.1 0.9 × F 0 ≤ F A ≤ 1.1 × F 0 - in the case of (R A - R 0) / R 0 < -0.1 F 0 < F A < F 0 × 1 − 5.0 × R A − R 0 / R 0 - in the case of 0.1 < (R A - R 0) / R 0 F 0 × 1 − 5.0 × R A − R 0 / R 0 < F A < F 0 where - in the case of -0.1 ≤ (R A - R 0) / R 0 ≤ 0.1 0.9 × F 0 ≤ F A ≤ 1.1 × F 0 - in the case of (R A - R 0) / R 0 < -0.1 F 0 < F A < F 0 × 1 − 5.0 × R A − R 0 / R 0 - in the case of 0.1 < (R A - R 0) / R 0 F 0 × 1 − 5.0 × R A − R 0 / R 0 < F A < F 0 where F 0 is an initial set electrode force in the main current passage, R A is the average value or time integration value of the resistance between the electrodes from the start of the main current passage to the intermediate welding time T a, and R 0 is an average value or time integration value of a resistance between the electrodes from the start of current passage to the intermediate pressurizing time T a that is obtained in the case where current is passed under the same conditions as the main current passage in a state of no disturbance in the parts to be welded.