The invention relates to a retaining device for retaining objects on a vehicle wall, comprising: a supporting element (4) for placing on a front side (2) of the wall (1) with devices (5) for retaining one or a plurality of objects (6) and a fastening element (8, 9) for locking the supporting element (4) on a rear side (3) of the wall (1), as well as a method for mounting objects with this retaining device. In order to reduce the installation cost, and in order not to be dependent on the supporting wall thickness, the fastening element (8) is pin-shaped and has a head (9) at one end so that it can be inserted through an opening (7) in the wall (1) and can be prevented against sliding out in one direction, and the supporting element (4) comprises a connecting device (13) with which the supporting element (4) can be solidly connected to the fastening element (8) projecting from the front side (2) of the wall.