To provide the spot welding method of a steel sheet for enhancing fatigue strength of a welded joint while ensuring good working efficiency.

In the welding method of enhancing the fatigue strength of a spot welded joint of a steel sheet {thickness t(mm), tensile strength TS(MPa)}, in a holding time Ht (ms) after spot welding (satisfying Ht=200t-80), after the lapse of the initial-stage pressurizing force holding time Hti (ms) (satisfying 0.35 HtHti0.65 Ht) with initial-stage pressurizing force Pi (kN) [Pi=2.45t {or Pi=2.45t(TS/270)0.5}], the pressurizing force is increased from the initial-stage pressurizing force Pi (kN) to a later-stage pressurizing force Pa (kN) (satisfying 1.5 PiPa2.5 Pi); and then, a later-stage pressurizing force holding time Hta (ms) (satisfying Hta=Ht-Hti) is made to elapse with the later-stage pressurizing force Pa (kN).