Abstract: An elevator shaft door having a door part that comprises two panels, which are suspended on rolling carriages and guided at the bottom. These door parts perform movements of different length in the same direction during an opening and closing movement, and during these movements move past one another on parallel tracks, with a changing overlap. The rolling carriage of the panel that moves ahead during a closing movement is attached to the ends of a tension cable that is fixed in place, which is guided around deflection rollers that are mounted to rotate on the rolling carriage of the other panel, which moves behind. The deflection rollers are arranged to rotate around vertical axes of rotation and have different diameters.