An assembly support for a vehicle door of a passenger vehicle is equipped with a locking system. The assembly support is designed for fastening to the body shell of the vehicle door. A lock unit of the locking system is fastened to the assembly support. In order to simplify the assembly of the vehicle door, an outside actuating unit of the locking system is likewise fastened to the assembly support and/or to the lock unit, the outside actuating unit being coupled to the lock unit via an operative connection.