The purpose of this invention is to provide: a laser-welded lap joint; a method for producing a laser-welded lap joint; and a structural component for motor vehicle having said laser-welded lap joint. This laser-welded lap joint has a weld joined by laser-welding a plurality of overlapped steel plates, wherein the weld is formed in a J-shape comprising a main weld in which the weld line is a straight line, and a weld end in which the weld line shape formed at one end of the main weld is formed in an arcuate or circular shape. The length L1 (in mm) of the main weld falls within the range of 2/3 to 4/5, inclusive, of the entire length L (in mm) of the weld represented by formula (1). The radius R (in mm) of the weld end satisfies formula (2), the angle θ (rad) of the weld end satisfies formula (3), and the total size of the gaps between the plurality of metal plates at the lap portion obtained by overlaying the plurality of steel plates is 0% to 15%, inclusive, of the total plate thickness of the plurality of steel plates. Formula (1): 10.0≤L, Formula (2) 0.5≤R≤1.5, Formula (3) 5/6π≤θ≤2π
展开▼
