Adjusting device for adjusting at least one optically relevant structural unit of a motor vehicle headlamp, which adjusting device comprises the following: - a drive device with a first adjusting element which is linearly adjustable along a displacement axis, is arranged in a rotationally fixed manner, and has a first engagement section - a transmission element in mechanical engagement with the first actuating element, the transmission element having a first mating engagement portion corresponding to the first engagement portion of the first actuating element - a bearing bushing, in which the transmission element is mounted rotatably about the displacement axis by means of a bearing section of the transmission element, the bearing bushing being fixedly connected to a supporting frame, it being possible for the at least one optically relevant structural unit to be arranged on the supporting frame, and - a second actuating element which is rotatably mounted about the displacement axis and has a second engagement portion, the transmission element having a second mating engagement portion, which second mating engagement portion is arranged opposite the first mating engagement portion of the transmission element on the displacement axis and wherein the second mating engagement portion is mechanically engaged with the second engagement portion, and wherein the second actuator in combination with the first engagement portion of the first actuator is adapted to convert a rotational movement of the second actuator into a stroke movement of the transmission element along the shift axis, wherein the second counter-engagement portion of the transmission element is formed as a second opening, wherein the second actuating element is supported in the second opening of the transmission element so as to be displaceable along the displacement axis, characterized in that the first engagement portion of the first adjusting element is formed as a thread and the first mating engagement portion of the transmission element is formed as a first opening with a mating thread corresponding to the thread, the transmission element being at least partially screwed onto the first adjusting element via the mating thread, wherein the support frame is arranged horizontally when the adjusting device is installed in a properly installed motor vehicle headlamp, and wherein the displacement axis is arranged vertically, wherein the support frame rests on the bearing bush due to its own weight in such a way that the adjusting device is preloaded. - a drive device with a first adjusting element which is linearly adjustable along a displacement axis, is arranged in a rotationally fixed manner, and has a first engagement section - a transmission element in mechanical engagement with the first actuating element, the transmission element having a first mating engagement portion corresponding to the first engagement portion of the first actuating element - a bearing bushing, in which the transmission element is mounted rotatably about the displacement axis by means of a bearing section of the transmission element, the bearing bushing being fixedly connected to a supporting frame, it being possible for the at least one optically relevant structural unit to be arranged on the supporting frame, and - a second actuating element which is rotatably mounted about the displacement axis and has a second engagement portion, the transmission element having a second mating engagement portion, which second mating engagement portion is arranged opposite the first mating engagement portion of the transmission element on the displacement axis and wherein the second mating engagement portion is mechanically engaged with the second engagement portion, and wherein the second actuator in combination with the first engagement portion of the first actuator is adapted to convert a rotational movement of the second actuator into a stroke movement of the transmission element along the shift axis, wherein the second counter-engagement portion of the transmission element is formed as a second opening, wherein the second actuating element is supported in the second opening of the transmission element so as to be displaceable along the displacement axis, characterized in that the first engagement portion of the first adjusting element is formed as a thread and the first mating engagement portion of the transmission element is formed as a first opening with a mating thread corresponding to the thread, the transmission element being at least partially screwed onto the first adjusting element via the mating thread, wherein the support frame is arranged horizontally when the adjusting device is installed in a properly installed motor vehicle headlamp, and wherein the displacement axis is arranged vertically, wherein the support frame rests on the bearing bush due to its own weight in such a way that the adjusting device is preloaded.