Fastening device for a bumper reinforcement

There is provided a fastening device for a bumper reinforcement, the weight is reduced while ensuring a sufficient strength. In a fixing device for a bumper reinforcement for the purpose of mounting the same on either a front side or on a rear side of a side frame that is provided on both sides across the width of the vehicle and extending in the longitudinal direction of the vehicle, there is a bumper reinforcement of two or more tubes with a length at least the distance between the side frames corresponding to said pipes are arranged horizontally above one another so that their exterior surfaces are at the same position in the longitudinal direction of the vehicle, and corresponds to a middle position in the height direction of the bumper reinforcement in about a central position in the height direction of the side frame.