The body of a notchback motor vehicle, having at the rear, a rear load floor to which are fixed two lateral members each having a wheel housing and a lateral quarter pillar forming one part of one side of the passenger compartment. The two lateral quarter pillars are held together at the top by a cross member known as the rear window cross member, which supports the roof. Stiffening at least one lateral member in such a way as to transfer the forces exerted on the bottom of the body when the vehicle is moving directly to the upper cross member having a panel stiffener which is joined to the lateral quarter pillar and which exerts from the rear window lower cross member to the rear window upper cross member.
Coupling members include a first coupling portion (X) that couples rear quarter inner members to upper surfaces of rear suspension base members, a second coupling portion (Y) that couples upper surfaces of the rear suspension base members together, which are located on the right and the left in pairs, and a third coupling portion (Z) that joins the second coupling portion to couple the rear quarter inner members together, which are located on the right and the left in pairs, the coupling member being integrally formed, and there is formed a bulkhead structure in a portion surrounded by the first, second and third coupling portions.
