A frame structure is provided for the underbody of a self-supporting motor vehicle bodywork. The frame structure includes, but not included with an elongate tunnel and two sillboards parallel hereto. The sillboards are disposed on both sides of the tunnel. The frame structure also includes, but is not limited to a dashboard cowl with closing plate, which is connected directly to both sillboards and the tunnel, a wheel housing with a downwardly open main structural arc, the ends whereof are connected to the underbody, and on its side facing the underbody (e.g., the vehicle inner side) the main structural arc has a damper receptacle in its upper area, from which a supporting strut connected to the underbody projects downward.