The present invention provides a mechanical interface apparatus (1) for a motor drive unit (2) in motor vehicles, in particular in a motor vehicle door, which is firmly connected to the drive unit (2) and has holding and guide devices (4, 6) for holding a control or plug unit (3a, 3b), with a cut-out (5), which passes all the way through, being formed between the interface apparatus (1) and the drive unit (2) in order to pass through at least one plug contact (30), a component mount (31) or the like for the control or plug unit (3a, 3b); and with at least two guide devices (8, 9) being provided in or close to the drive unit (2) for guiding the plug contacts (30) and/or the component mounts (31) or various control or plug units (3a, 3b) of this type.