To provide a welding method for a plated steel sheet, by which a weld quality can be improved while.shortening a weld time.

In a welding method for a plated steel sheet, concerning a first execution form, while forming grooves 22 extending from a nonpressure welding part Y toward a tip part on the X side of a pressure welding part on a surface 20a on the inside of the lapping part W of the plated steel sheet 20, the lapping part W is welded. That is, since the relief passes of zinc gas 29a, 29b are secured in advance by gaps 25 by plural groove parts 22 formed on the plated steel sheet 20, the zinc gas 29a, 29b does not remain in the nonpressure welding part Y or a joining melting zone Z, the zinc gas can be discharged into the outside space of the plated steel sheets 20, 30. Consequently, zinc components after vaporization, etc., can be quickly discharged out of the nonpressure welding part Y of the lapped part W as the zinc gas 29a, 29b. Therefore, an effect that can improve a weld quality is obtained while shortening a weld time.