A fastening device for fastening a binding unit of a ski binding, in particular a front unit of a ski binding and/or a heel unit of a ski binding, on a ski and for adjusting a position of the binding unit of the ski binding in the longitudinal direction of the ski relative to the ski, comprising: a) a base unit for fastening the fastening device on the ski, b) a binding holding unit to which the binding unit can be attached, wherein the binding holding unit is mounted or can be mounted on the base unit so as to be displaceable along a longitudinal axis of the base unit relative to the base unit from a first position to a second position and back, and c) a locking arrangement for releasably locking the binding holding unit in the first position and in the second position, wherein the locking arrangement has two locking elements (40.1, 40.2) which are mounted or can be mounted on a first unit of the base unit and the binding holding unit so as to be movable from a locking state into a release state and back, wherein the second unit of the base unit and the binding holding unit is the other of the base unit and the binding holding unit than the first unit of the base unit and the binding holding unit, wherein the two locking elements (40.1, 40.2) each form a positive connection with a second unit of the base unit and the binding holding unit in order to lock the binding holding unit in the respective first position and second position, wherein in the release state of the two locking elements (40.1, 40.2) the form-fitting connection of the two locking elements (40.1, 40.2) with the second unit of the base unit and the binding holding unit is released, so that the binding holding unit can be displaced along the longitudinal axis of the base unit relative to the base unit from the first position into the second position and back, characterized in that the fastening device comprises a forced control by which the two locking elements (40.1, 40.2) are movable relative to each other in order to move the two locking elements (40.1, 40.2) from the locking state to the release state and back, and that the fastening device comprises a prestressed elastic element for prestressing the two locking elements (40.1, 40.2) towards the locking state. a) a base unit for fastening the fastening device on the ski, b) a binding holding unit to which the binding unit can be attached, wherein the binding holding unit is mounted or can be mounted on the base unit so as to be displaceable along a longitudinal axis of the base unit relative to the base unit from a first position to a second position and back, and c) a locking arrangement for releasably locking the binding holding unit in the first position and in the second position, wherein the locking arrangement has two locking elements (40.1, 40.2) which are mounted or can be mounted on a first unit of the base unit and the binding holding unit so as to be movable from a locking state into a release state and back, wherein the second unit of the base unit and the binding holding unit is the other of the base unit and the binding holding unit than the first unit of the base unit and the binding holding unit, wherein the two locking elements (40.1, 40.2) each form a positive connection with a second unit of the base unit and the binding holding unit in order to lock the binding holding unit in the respective first position and second position, wherein in the release state of the two locking elements (40.1, 40.2) the form-fitting connection of the two locking elements (40.1, 40.2) with the second unit of the base unit and the binding holding unit is released, so that the binding holding unit can be displaced along the longitudinal axis of the base unit relative to the base unit from the first position into the second position and back, characterized in that the fastening device comprises a forced control by which the two locking elements (40.1, 40.2) are movable relative to each other in order to move the two locking elements (40.1, 40.2) from the locking state to the release state and back, and that the fastening device comprises a prestressed elastic element for prestressing the two locking elements (40.1, 40.2) towards the locking state.