The motor vehicle fender support comprises a metal core with a top portion provided with fasteners for fastening to a fender. The top portion is provided with ribs arranged to stiffen it in the event of stress being directed in the transverse direction, and to buckle in the event of downwardly-directed impacts, when the fender support is mounted on the vehicle. The metal core also includes openings seeking to reduce its stiffness so as to satisfy predefined deceleration criteria. The fender support also comprises a rigid bottom portion designed to be fastened to the structure of the vehicle.