LASER WELDING METHOD, LASER WELDING DEVICE, AND WELDED MEMBER

[OBJECT] To provide a laser welding method, a laser welding device, and a welded member that are able to suppress the occurrence of blow holes and obtain a favorable weld. [MEANS OF ACHIEVING THE OBJECT] A laser welding method for welding a plurality of metal members to each other by irradiating laser light 51 in a region where a plurality of metal member are superposed, comprising a pretreatment process and a welding process. At least one metal member of the plurality of metal members is formed from a metal-plated steel plate in which a base metal has been covered with a coating material that has a melting point lower than the base metal. In the pretreatment process, with the position of the first metal member 21 (one of the metal members) in the in-plane direction fixed, processing is performed from the front surface 21a (one side surface) of the first metal member to form on the back surface 21 b (other side surface), which is the other side, a protrusion 23 that bulges from the back surface. Then, in the welding process, the first metal member in which a protrusion has been formed is superposed on a second metal member 22 (another metal member) with the protrusion therebetween while maintaining the position in the in-plane direction, and laser light is irradiated on the superposed region to weld the plurality of metal members to each other.