Abstract: A hold-up device for holding a hinged structure, particularly the rear door of a hatchback automobile, in an open position relative to a frame, such as the frame of the door, against the force of gravity, wherein a hydraulic cylinder is pivotally connected to either the structure or the frame and a cylinder rod is pivotally connected to the other of the structure and the frame. The hold-up device is for use when the cylinder fails to function properly and comprises a body having first and second opposite ends and a straight elongate contoured alcove extending between the first and second ends for removably receiving the rod therein when the structure is in its open position.