Remote-controllable, impact-resistant door opener having a housing for installation in a door with a preferably fixed door frame and a door leaf which is mounted thereon in a moveable manner, said door leaf having a moveable door opener latch, a remote-controllable locking device and an interposed changer, which is formed as a one-arm or multi-arm lever and interacts with the door opener latch in such a way that the door opener latch can be switched into a locked position and a released position, wherein it is provided that - the locking device has a remotely switchable actuating device (19, 20, 21) and a locking lever which interacts with the changer and can be switched via the remotely switchable actuating device (19, 20, 21) between a locked position, in which the locking lever is in abutment with the changer, and a released position, in which the locking lever is not in abutment with the changer, and - the locking lever interacts with a securing device which can be switched via the remotely switchable actuating device (19, 20, 21) in order to fix the locking lever in the locked position or release it to switch over into the released position, and - the locking lever has a securing pin which is arranged in parallel to the axis of rotation in an end section which is at a distance from the axis of rotation of the locking lever, said securing pin engaging with its end section facing away from the locking lever in a locking recess of the securing device in the locked position, characterised in that - the remotely switchable actuating device (19, 20, 21) interacts with the securing device and/or the securing pin in a first actuating step in such a way that the securing device is moved in parallel to the longitudinal axis of the securing pin in such a way that the securing pin becomes disengaged from the locking recess and the remotely switchable actuating device (19, 20,21) interacts with the securing device and/or the securing pin in a second actuating step in such a way that the securing pin is moved laterally and the locking lever is pivoted from the locked position into the released position. - the locking device has a remotely switchable actuating device (19, 20, 21) and a locking lever which interacts with the changer and can be switched via the remotely switchable actuating device (19, 20, 21) between a locked position, in which the locking lever is in abutment with the changer, and a released position, in which the locking lever is not in abutment with the changer, and - the locking lever interacts with a securing device which can be switched via the remotely switchable actuating device (19, 20, 21) in order to fix the locking lever in the locked position or release it to switch over into the released position, and - the locking lever has a securing pin which is arranged in parallel to the axis of rotation in an end section which is at a distance from the axis of rotation of the locking lever, said securing pin engaging with its end section facing away from the locking lever in a locking recess of the securing device in the locked position, characterised in that - the remotely switchable actuating device (19, 20, 21) interacts with the securing device and/or the securing pin in a first actuating step in such a way that the securing device is moved in parallel to the longitudinal axis of the securing pin in such a way that the securing pin becomes disengaged from the locking recess and the remotely switchable actuating device (19, 20,21) interacts with the securing device and/or the securing pin in a second actuating step in such a way that the securing pin is moved laterally and the locking lever is pivoted from the locked position into the released position.