The invention relates to a carrier structure of a motor vehicle in a spaceframe style, said structure comprising a roof frame (1) provided with a longitudinal member (1a) and a cross member (1b), longitudinal members (2a, 2b) which are arranged on both sides at the level of the vehicle floor and consist of hollow profiled elements, and posts (3, 4, 5) in the form of hollow profiled elements, connecting the longitudinal members (1a, 1b) of the roof frame (1) to the longitudinal members (2a, 2b) on the side of the floor. The inventive carrier structure is characterised in that at least two opposing posts (3, 4, 5) of the member structure, especially the B, C or D posts, are embodied as double plates formed under internal high pressure and welded on the peripheral edge thereof. The peripheral edge forms flanges (3c, 5c) for door and/or window seals, and the respective ends of the posts (3, 4, 5) are embodied as connection regions (31, 51, 32, 52) adapted to the shape of the longitudinal members (2a, 2b) on the side of the floor and the longitudinal members (1a) of the roof frame (1), and used for connection to the same.