A driverless transport device for assembling a motor vehicle comprising a drivable base and a vehicle carrier coupled to the base and extending in a longitudinal direction, is configured and developed in terms of a flexible production using simple constructional means, in such a way that the vehicle carrier has actuatable receiving points for carrying the motor vehicle, the vehicle carrier can be moved along its longitudinal direction relative to the base by means of a guide device and can be tilted around an axis oriented orthogonally to the longitudinal direction, such that the at least partially assembled motor vehicle can drive off of the vehicle carrier on its own wheels when receiving points are released from the motor vehicle. The invention also relates to a method for unloading a motor vehicle from a driverless transport device that functions to assemble the motor vehicle.