A device for mechanically preventing the automatic opening of a vehicle door in the event of an object acting thereon includes a mounting clip fixed to an outer door part for an outer door handle. The mounting clip has a door opening mechanism having a balancing mass which is adjustably supported on the mounting clip and operatively connected to the outer door handle and can also be moved from a first operating position into a second operating position and back. A force introduction and locking element is associated with the balancing mass. A movement of the balancing mass from the first operating position into the second operating position can be prevented, limited, and/or reversed by way of the element. When viewed in the direction of movement of the bar the force introduction and locking element is advantageously supported against a door lock housing that is fastened to the vehicle door.