The locking device comprises a coupling element (5). Said device can be electronically controlled with a moving actuator on the coupling element and brought into a first and a second coupling condition. An output element (4) can be connected to the locking means. In the first coupling condition, a rotor is decoupled from the output element (4) in the sense that no direct coupling, by means of the coupling element or other coupling means, is provided which would mean that a rotation of the rotor would cause a movement of the output element. In the second coupling position the coupling element couples the output element (4) with a rotor (2) which may be operated by means of a key, door handle, door knob, a similar means, or by an electrical actuation.