Abstract: A bumper beam for automobiles is composed in cross section of a top wall, a bottom wall opposed to the top wall, a pair of lateral walls connecting the top and bottom walls at opposite ends, one of the lateral walls being a collision side lateral wall and the other a vehicle-mounted side lateral wall, and a connection rib provided intermediate between the top and bottom walls and connecting the lateral walls. The collision side lateral wall is thicker than the vehicle-mounted side lateral wall, and both corners at opposite ends of the collision side lateral wall are curved with a radius of curvature R of 0.1-0.3 of the length of the collision side lateral wall and both corners at opposite ends of the vehicle-mounted side lateral wall are curved with a radius of curvature of 0.6-2.0 of the thickness of the vehicle-mounted side lateral wall. Alternatively, radius of curvature R may be 0.2-0.6 of the length of the bottom wall.

Abstract: A bumper beam for automobiles is composed in cross section of a top wall, a bottom wall opposed to the top wall, a pair of lateral walls connecting the top and bottom walls at opposite ends, one of the lateral walls being a collision side lateral wall and the other a vehicle-mounted side lateral wall, and a connection rib provided intermediate between the top and bottom walls and connecting the lateral walls. The collision side lateral wall is thicker than the vehicle-mounted side lateral wall, and both corners at opposite ends of the collision side lateral wall are curved with a radius of curvature R of 0.1-0.3 of the length of the collision side lateral wall and both corners at opposite ends of the vehicle-mounted side lateral wall are curved with a radius of curvature of 0.6-2.0 of the thickness of the vehicle-mounted side lateral wall. Alternatively, radius of curvature R may be 0.2-0.6 of the length of the bottom wall.