DOOR FOR VEHICLE

A door of a vehicle may include a first door module forming a door skeleton; and a second door module coupled with the first door module and forming a door window; wherein the second door module includes a relatively lightweight material as compared to the first door module; a reinforcement member is inserted along an edge portion forming the door window of the second door module; and a stepped portion is formed at the reinforcement member, reducing weight and cost of the door of the vehicle.