PURPOSE: A door impact beam for a vehicle is provided to improve structural hardness by being installed inside a front door and a rear door. CONSTITUTION: A door impact beam(1) for a vehicle comprises a door panel and two stage rails(5). The two stage rail is horizontally fixed inside the door panel. The two stage rail forms a fixed pattern along the longitudinal direction of the door panel. The door impact beam is welded and fixed with both sides of the door panel through both ends of the two stage rail. The two stage rail is composed of an upper rail(7) and a lower rail(9). The upper rail is formed with a bent portion(B) at the center thereof.
