Abstract: In a folding trailer (1) comprising at least a bottom (2), two wheels (17) connected to the bottom by a wheel suspension, and a towing bar (7) for coupling the trailer to a tractive vehicle. The bottom comprises a central section (3) at the height of the wheels (17), a front and rear sections (5,4) each of which can be moved relatively to the central section (3) between a working position in which they lie in one plane with the central section and a folded position in which they lie parallel to each other and transversely to the central section. The wheel suspension (42) is shaped in such a way that the wheels (17) can be accomodated within the space defined in the folded state by the central section and the front and rear bottom sections.