An inner gusset plate is connected, in each case in the region of the C pillar, to a roof frame cross-member, to a lateral roof frame member and to a rear sealing channel cheek of a motor vehicle or of a rear part of a motor vehicle. The inner gusset plate is arranged opposite a further, outer, connected gusset plate. The two gusset plates form a pillar profile and are connected to a wheel box of the body structure. The inner gusset plate is supported via adjoining inner brackets on a longitudinal member of the vehicle, which longitudinal member is adjoined by two cross-members in the vehicle floor, which cross-members are arranged in the region of the supporting base of the inner bracket on the longitudinal member.