Actuator

The actuating device (1) comprises a housing (4), a spindle gear (13) housed in the housing, and an axial gear spindle (3), which is rotatably fastened opposite to the housing in a displaceable manner. An electric motor (10) is provided, which is coaxially arranged around the gear spindle and is displaced by a rotary drive of the spindle gear axially opposite to the housing. A detection unit (23) is provided, which is fixed relative to the housing.