Mounting device for a seat device

The fastening device has a fastening profile (1) which is fixed on a vehicle base (4) and has a fastening groove (2) with a longitudinal slot, where the fastening groove is running in the longitudinal direction. The fastening profile has a base plate (3) facing the vehicle base. The width of the base plate is carried out transverse to the longitudinal direction of the fastening profile more than 15 centimeter, particularly more than 20 centimeter or 25 centimeter.