REAR COMPARTMENT OF A MOTOR VEHICLE PROVIDED WITH A REINFORCEMENT FOR ATTACHING A FUEL TANK AND VEHICLE COMPRISING SUCH A COMPARTMENT

Rear compartment of a motor vehicle, delimited by a right rear side member (2a), a left rear side member (2b), a central cross-member (3), a rear cross-member (4) and the lower face of a rear floor (5a), comprising: a. a seat reinforcement plate (10) disposed facing the upper face of the rear floor (5a), the seat reinforcement plate (10) and the rear floor (5a) being designed so as to form a hollow body (C1, C2) extending on either side of a median plane of the motor vehicle, b. a reinforcement cross-member (6, 6a, 6b) for a seat safety belt hook extending from the right rear side member (2b) to the left rear side member (2b), and at least one tank reinforcement plate (7) connecting the rear floor (5a), the rear cross-member (4) and the reinforcement cross-member (6, 6a, 6b) for a seat safety belt hook and disposed beneath the hollow body formed by the seat reinforcement plate (10) and the rear floor (5a).