Abstract: The driving units (AX,AY) comprise each an electric motor (14) which by means of a mechanical transmission (16,15,17,18,21,20) drives a rack (13) arranged substantially at right angles with the mirror holder (1), which is articulatingly connected thereto (at 113) and is guided in the housing (3) for the mirror holder (1). A control device (25) is provided which allows to move the mirror holder (1) into the required position by having it angularly moved by means of the two electric motors (14) around the one and/or the other pivot axis (X--X, Y--Y), and which also allows to store one or more positions of the mirror holder (1) and to have the same automatically moved into one or the other of these stored positions by means of a selecting respective control and with the aid of detectors (24) of the angular position of the mirror holder (1) around each one of the two pivot axes (X--X, Y--Y).