A door impact beam for a door of a motor vehicle includes a first fastening portion configured to be fastened to a first fastening intersection of the door and a second fastening portion configured to be fastened to a second fastening intersection of the door. A profiled portion extends between the first fastening portion and the second fastening portion. The profiled portion is designed at least in sections as a hollow profile with two side walls disposed opposite to each other and two connecting walls disposed opposite to each other which connect the side walls to each other. The connecting walls have an outwardly directed convex curvature.