Laser welding method and laser welding device

This laser welding method performs laser welding on a first end portion of a first member in a first direction and a second end portion of a second member adjacent to the first member in a second direction intersecting the first direction, the second end portion being disposed such that a distance along the first direction from the first end portion is 0 or more. The laser welding method includes the steps of: irradiating laser light toward a first end portion to form a first weld pool extending toward at least a second end portion side of the first end portion; a step of irradiating laser light toward at least the first end portion after the step of forming the first molten pool, thereby forming an erected molten pool that includes the flowable metal material contained in the first molten pool and that is erected between the first end portion and the second end portion; and solidifying the erected molten pool. 本发明的激光焊接方法对第一构件的第一方向的第一端部和在与第一方向交叉的第二方向上与第一构件相邻的第二构件的第一方向的第二端部进行激光焊接，第二端部配置为，第一端部距该第二端部的沿着第一方向的距离成为