Abstract: The invention relates to a device for starting a motor vehicle motor. According to the invention, a slot is (11) used for inserting (59) the key (50) which is usually closed by a spring-loaded cover (14). The key (50) is displaced in the slot (11) into various key positions (20.1), in order to control different functions of the motor or other ancillary devices in the vehicle. In order to ensure a compact construction which is easy to use, the inventive device prevents the key (50) from turning in the slot (11) and the key (50) is displaced into at least three operating positions (20.1) for the control functions which are axially staggered. After being inserted for a first operating distance (51), the key takes up an initial position (20.1), in which it is secured in the slot (11) in a force-fit. In a subsequent second intermediate position, the key (50) is secured in a positive fit which can be locked automatically. This prevents the manual withdrawal (57) of the key (50).