Fastening device for loads on a boundary surface of a loading area of a motor vehicle, and motor vehicle

A fastening device for loads on a boundary surface of a loading area of a motor vehicle, the boundary surface having at least one penetration, the fastening device comprising:

• for fastening a load attachment unit having swivelable retaining arms for fixing the load attachment unit to the boundary surface, the swivelable retaining arms projecting through the penetration in a fitted state;
• an actuating element disposed inside the load attachment unit, the actuating element being movably mounted in the load attachment unit for movement between a blocking position and a release position and the actuating element interacting with the swivelable retaining arms such that in the blocking position of the actuating element the swivelable retaining arms are forcibly moved by the actuating element into a spread-out fixing position gripping behind a rim of the penetration, and in the release position of the actuating element the retaining arms are released for a swivel movement.