Disclosed herein is a door module for a vehicle, which is mounted in a door panel of a vehicle door. The door module may include: a stiffened plate including base plates formed at positions where one or more hardware parts related to the vehicle door are mounted and a connection plate for connecting the base plates, wherein the base plates and the connection plate are integrally formed; and a resin panel covering an opening of the door panel, and formed by over-molding resin onto the stiffened plate, wherein the stiffened plate is formed of a material having higher stiffness than the resin.