A motor vehicle includes a body which has a floor, where an open hollow profile is formed in the floor. The open hollow profile is bridged by the crossbeam. The crossbeam has at least one open hollow profile in a center region of the crossbeam, where a first outer profile section and a second outer profile section are integrally attached to the at least one open hollow profile in a transverse direction. The first outer profile section and the second outer profile section are spaced apart from one another by the at least one open hollow profile. The first outer profile section has a first rounded outer profile section and the second outer profile section has a second rounded outer profile section.