A vehicle sliding door system includes a door portal and a door opening, at least one sliding door with an, in the closing direction of the sliding door, vertical front lateral edge and an, in the closing direction of the sliding door, vertical rear lateral edge, and a door driving unit for displacing the sliding door. The door driving unit has a cable, which, with its first end, is attached to the sliding door in the region of the front vertical lateral edge, and with its second end in the region of the rear vertical lateral edge, a coupling member, connected to the cable and which is connected to a motor, which is attached on the door portal laterally next to the door portal and which drives the coupling member such that the cable is movable along its longitudinal extent in both directions of movement and displaces the sliding door.