Door opener for a door, having a door leaf moveably mounted in or on a door frame, said door opener formed as a unit that is able to be mounted in or on the stationary door frame or a fixed wing for engaging with a lock latch on the door leaf or is able to be mounted in or on the door wing for interaction with a counter element on the fixed door frame or fixed leaf, wherein the door opener comprises: - a moveably mounted door opener latch, - an electrically switchable locking device, having an electric actuator, e.g. an electromagnet, and a locking member which is able to be controlled by the actuator, e.g. an armature, - an unlocking switch device that interacts with the locking member of the locking device and is able to be switched by means of a manual switch actuating element into an "off' switch position and an "on" switch where it is provided that, when the unlocking switch means is in the "off' switch position, the locking device is able to be switched electrically into a locked position and a release position, wherein the locking device in the locked position locks the door opener latch under the influence of the locking member in order to the fix the door wing in the closed position, and, in the release position, releases the door opener latch in order to reverse this locking of the door wing; when the unlocking switch means is in the "on" switch position, the locking member and/or the locking device are or is permanently switched into the release position and the door opener latch is thereby released, and wherein it is provided that - the unlocking switch means has a switch housing in which the manual switch actuating element is mounted to be moveably guided, - the manual switch actuating element and the switch housing interact by means of a switching link means (11vk, 12s) for setting the "off' switch position and the "on" switch position, - the manual switch actuating element is formed as a switching button that can be actuated manually by means of an exclusively axial pressing actuation, - the switching button has a switching tappet, characterised in that - the unlocking switch means is formed as a mechanical switch means that has exclusively mechanically acting components, and - the switching plunger of the switch button interacts with the locking member of the locking device by means of a transfer device guided in the door opener. - a moveably mounted door opener latch, - an electrically switchable locking device, having an electric actuator, e.g. an electromagnet, and a locking member which is able to be controlled by the actuator, e.g. an armature, - an unlocking switch device that interacts with the locking member of the locking device and is able to be switched by means of a manual switch actuating element into an "off' switch position and an "on" switch where it is provided that, - the unlocking switch means has a switch housing in which the manual switch actuating element is mounted to be moveably guided, - the manual switch actuating element and the switch housing interact by means of a switching link means (11vk, 12s) for setting the "off' switch position and the "on" switch position, - the manual switch actuating element is formed as a switching button that can be actuated manually by means of an exclusively axial pressing actuation, - the switching button has a switching tappet, - the unlocking switch means is formed as a mechanical switch means that has exclusively mechanically acting components, and - the switching plunger of the switch button interacts with the locking member of the locking device by means of a transfer device guided in the door opener.