Abstract: In order to improve an actuating device for a trailer coupling, in particular, for actuating a trailer coupling with a ball neck movable between an operative position and a rest position, for example, a locking device of such a trailer coupling, comprising a device base which can be mounted on the vehicle and a lever which is mounted on the device base so as to be movable and can be moved from a starting position, in which no actuation of the trailer coupling takes place, into an actuating position, whereby the trailer coupling is acted upon by means of a movement transfer device, in such a manner that this can be operated as favorably as possible it is suggested that a securing device be provided on the lever which secures the lever against any actuation in the starting position.