A folding wheelchair includes two side frames, which are connected to each other via a cross-strut. A fabric is stretched between the side frames in order to form a seating area of a seat. The side frames are formed identically and include an outer tube and an inner tube. The outer tubes have a slot extending in a longitudinal direction (L), which opens at least into an outer tube end. The inner tubes each include a slot extending in the longitudinal direction (L), which opens at least into an inner tube end. A tensioning rod is accommodated in one of the outer tubes and opens into the associated inner tube. The fabric is led to the outside through the slots of the inner tube and outer tube. The inner tube, the fabric and the tensioning rod are connected to one another.