A lifting device is for a container. The lifting device is arranged to be attached at one end of the container. The lifting device comprises a tow bar being adjustable between an erect position and an unfolded position; an undercarriage connected to the tow bar and provided with one or more wheels, the undercarriage being adjustable between at least a raised position and a lowered position, and the undercarriage being arranged, in the lowered position, to carry at least part of the weight of the container. The undercarriage is arranged to be adjusted from the raised position into the lowered position by means of manual force and/or gravity. The undercarriage is arranged to be adjusted from the raised position to the lowered position when the end of the container has been lifted above the supporting surface. A method is for using a lifting device for a container.