To improve weld strength through formation of a stable and sound weld bead free from blowholes by performing the laser welding of steel sheets keeping a designated distance of gap each other so as to prevent generation of decomposition gas or releasing of the gas even if a small amount of vaporized gas is generated due to overheat of a metal sheet during laser welding.

The welding method is applied for welding workpieces 11, 12 at least either one of which is a zinc coated steel sheet. Both the steel sheets are temporarily joined through a temporary fixing member 14 with a designated thickness at the positions other than predetermined welding points on the workpieces. Then the laser welding is performed at the predetermined welding points on the workpieces, keeping the open gap equivalent to the designated thickness.