Abstract: The invention relates to a folding container (100) having a first and second side wall (11, 13), a roof (10), a floor (20) as well as a face end (12) and a back end, wherein the first side wall (13) and the second side wall (11) are slideable along the roof (10) and along the floor (20) respectively in such a manner that the lateral parts (11, 13) are slideable inward of the container (100) until they lie parallel to the floor (20). In order to offset friction losses in the longitudinal rails of folding containers (100), the invention proposes that the roof (10) and the floor (20) are provided with spaced longitudinal rails (14, 15, 16, 17) running parallel to one another for a roll guide of the first side wall (13) slideable on the roof (10) and for a roll guide of the second side wall (11) slideable on the floor (20), wherein in the longitudinal rails (14, 15, 16, 17) tension springs (30) are integrated which with a folded-out container (100) are tensioned and with a folded-up container (100) are relaxed.