A loading base for load spaces in motor vehicles includes two loading base segments arranged one behind the other in the direction of the vehicle longitudinal axis. A first loading base segment adjacent to the back seats is connected to a rail system, which may be pivoted about a pivot axis aligned in the direction of the transverse axis of the motor vehicle with a lifting device arranged in the region of a rear loading edge, and adjusts the first loading base segment in the direction of the vehicle longitudinal axis in a translatory manner, so that irrespective of the height of the loading edge easy loading and unloading of loads is possible. The rail system and the lifting device are configured in the manner of a longitudinal seat adjustment device and seat height adjustment device of a motor vehicle seat.