Method for producing a support structure

The present invention relates to a method for producing a support structure, preferably a support structure for a vehicle seat having at least one seat shell 18 for the seat part and/or the backrest of the vehicle seat, having the following method steps: producing a metal semifinished product 10 and reshaping it into an essentially flat plate 12, detaching a plate part from the plate 12, and deforming the plate part, the production of the metal semifinished product 10 being performed by extrusion. In a preferred embodiment of the method according to the invention, the semifinished product 10 is already formed into a flat plate 12 by the extrusion or the extrusion is performed with production of a curved plate 16, which is subsequently reshaped into a flat plate 12.