A radiator in a laser welding apparatus radiates a beam to a main region and an auxiliary region on a welding surface. The auxiliary region is positioned to be adjacent to the main region or to be apart from the main region. A welding direction is a direction in which a beam radiation region moves during laser welding. The auxiliary region includes at least an area positioned on a forward side of the main region in the welding direction. The radiator radiates the beam in a setting such that at least one peak occurs in each of the main region and the auxiliary region.