Underrun prevention member for vehicle bumper beam

An underrun prevention member for a bumper beam fixed to a vehicle, the bumper beam including a substantially vertical outer side wall facing an area outside the vehicle and a horizontal wall provided so as to be extended substantially horizontally from an upper or lower end of the outer side wall toward the vehicle, the bumper beam being disposed at a front portion or a rear portion of the vehicle so as to be extended substantially horizontally in a vehicle widthwise direction, and the underrun prevention member being integrally fixed to the bumper beam so as to protrude upward or downward from the horizontal wall to prevent an underrun of the bumper beam under an object outside the vehicle or an underrun of the object outside the vehicle under the bumper beam, the underrun prevention member comprising:

• a vertical plate portion integrally fixed to the outer side wall so as to be in surface contact with the outer side wall, protruding upward or downward from the horizontal wall by a predetermined protrusion length, and having a predetermined width in the vehicle widthwise direction;
• a reinforcement plate portion integrally formed to be continuous with a protruding end of the vertical plate portion, the reinforcement plate portion extending from the protruding end toward the vehicle so that the underrun prevention member is bent at the protruding end, and the reinforcement plate portion having a length in a vehicle front-rear direction being shorter than a length of the horizontal wall in the vehicle front-rear direction;
• and
• a pair of side plate portions, each side plate portion being (1) integrally formed to be continuous with and to extend from both ends of the reinforcement plate portion in the vehicle widthwise direction, (2) inclined with respect to the horizontal wall so as to gradually approach the horizontal wall, and (3) integrally fixed to the horizontal wall at outer end portions of the underrun prevention member.