A mounting bracket 11 formed of a material having a thickness which permits no resistance welding relative to the thickness of a plate constituting a vehicle body frame 10, having a mounting portion 28 which is so thick as not to be welded to the vehicle body frame 10 through resistance welding and on which components to be mounted 13, 14 are mounted, and being provided with a welding portion 33, adapted to be welded to the vehicle body frame 10, which is formed into a thickness which is thinner than the mounting portion 28 and which permits a resistance welding relative to the thickness of the plate which constitutes the vehicle body frame 10.