Abstract: A monitoring device for monitoring an entry or exit area of an access opening of a vehicle to a building component having an optical camera system including a first camera for providing a first image and a second camera for providing a second image, so that a stereo image can be generated from the first and the second image. The monitoring device also includes an analysis unit, such that at least one object in the entry or exit area can be detected from the stereo image and/or a position of the building component relative to at least one part of the vehicle can be determined from the stereo image for monitoring an entry or exit area.