The support structure of a body for a motor, vehicle is assembled from large-size partial modules. Two partial modules connected to each other comprise support sections and wall and/or floor sections connected thereto. Support sections of one partial module are connected to associated support sections of the other partial module at abutment points. In order to design a highly stressed connection between partial modules of the support structure in a very stable and simple manner, the support sections of the two partial modules, which support sections are assigned in each case to one another, are assembled to form a continuous support. Abutting surfaces of the assembled support sections run obliquely with respect to the direction of extent of the support. This oblique profile of the abutting surfaces creates a connection over a very large area in relation to the cross section of the support, which ensures an extremely stable connection of the two parts to each other.