Door opening device having an electrically operable door opener and having an unlocking device interacting with this, wherein it is provided that - the electrically operable door opener has a door opening latch, a locking device having at least one locking member formed as a locking lever or locking slide or locking piston and an electrical switching device having an electromagnet and an armature, wherein the locking member is switched between the armature and the door opening latch and the armature interacts with the locking member in such a way that the door opening latch is locked in a first switching position of the electrical switching device and the door opening latch is released in a second switching position of the electrical switching device, - the unlocking device has a magnet device and an actuating device controlling the magnet device in such a way that, in the unlocking position of the unlocking device, the magnet device acts on the armature of the electrical switching device of the door opener or on the locking member of the door opener or directly on the door opening latch of the door opener in such a way that the door opening latch is released regardless of the switching position of the electrical switching device of the door opener and, in an non-operating position of the unlocking device, the magnet device does not release the door opening latch, wherein it is provided that a) the magnet device of the unlocking device has a permanent magnet or an electromagnet, b) in the unlocking position of the unlocking device, the magnet device acts magnetically on the armature or the locking lever or the door opening latch by magnetically pulling this or magnetically pushing this away, c) the magnet device is mounted moveably with respect to to the door opener and the actuation device of the unlocking device has a mechanical transfer device which transfers thrust and/or tensile forces in order to switch the magnet device by shifting its position. - the electrically operable door opener has a door opening latch, a locking device having at least one locking member formed as a locking lever or locking slide or locking piston and an electrical switching device having an electromagnet and an armature, - the unlocking device has a magnet device and an actuating device controlling the magnet device in such a way that, in the unlocking position of the unlocking device, the magnet device acts on the armature of the electrical switching device of the door opener or on the locking member of the door opener or directly on the door opening latch of the door opener in such a way that the door opening latch is released regardless of the switching position of the electrical switching device of the door opener and, in an non-operating position of the unlocking device, the magnet device does not release the door opening latch, a) the magnet device of the unlocking device has a permanent magnet or an electromagnet, b) in the unlocking position of the unlocking device, the magnet device acts magnetically on the armature or the locking lever or the door opening latch by magnetically pulling this or magnetically pushing this away, c) the magnet device is mounted moveably with respect to to the door opener and the actuation device of the unlocking device has a mechanical transfer device which transfers thrust and/or tensile forces in order to switch the magnet device by shifting its position.