Rear bumper support for motor vehicle

The support has two fixation units (2, 3) for fixing a bumper on a rear part of a chassis (1) of a motor vehicle. A cross-member (4) with two opposite ends is arranged on the fixation units to form a supporting structure between the units. The cross-member is made of a thermosetting material, and has an upper side which constitutes the supporting structure for an upper part of the bumper.