This rear-end element (2) for motor vehicle includes a carrier structural element (6) forming an energy-absorbing element after impact, and a carrier structural frame (8). At least the carrier structural element (6) has a cellular structure formed of cells (30, 32) extending longitudinally through the carrier structural element (6) between a back face and a front face of the carrier structural element (6) and opening onto the back and/or front face of the carrier structural element (6). A rear end (44) which includes the rear-end element (2).