Floor modules of a cargo deck in a hull of an aircraft which comprise support devices for carrying functional elements, e.g. panels, roller conveyors or ball mats, are provided. The support devices are attachable in the hull of the aircraft directly or by way of intermediate elements. To improve stability at reduced weight, end support devices, as seen in the aircraft's longitudinal direction, have a thickness reduced in such a way compared to the other support devices of the floor module that only together with the end support devices of a floor module installed adjacently in the hull do they ensure a loading capacity that corresponds to at least the loading capacity of the other support devices.