A folding seat arrangement comprising a first carrying structure (2) having a backrest (3) and guiding elements (11) for the removable attachment in guide rails (9) to a vehicle floor, a second carrying structure (5) pivotally mounted to the first carrying structure (2) and having a seat cushion (4), and a supporting structure (6; 31), on which in a first end region guiding elements (10) are provided for the removable attachment in guide rails (9) and which in a second region is mounted a carrying structure (2; 5) in an articulated manner such that the seat arrangement in the folded setting requires the least amount of space in the lower region of the expanded luggage compartment. This is achieved in that the guiding elements (11) on the first carrying structure (2) and the supporting structure (6; 31) can be moved relative to one another to pivot the supporting structure (6; 31).