A first laser beam is radiated to a first radiation position of a welding object while intersecting a wire, and a second laser beam is radiated to a second radiation position that is spaced a predetermined distance from a target position of the wire. Arc welding is performed between the wire and the welding object while radiating the first laser beam and the second laser beam such that the first radiation position, the second radiation position, and the target position are disposed on a welding line of the welding object. In this way, it is possible to prevent the generation of spatter and perform welding at a high rate, without increasing the size of a molten pool.