more than 80 because the primary energy absorbing box 2 if pleated due to collapse needs the front bumper beam 1 to provide a reverse support the front bumper beam 1 is unable to provide an effective support if it slides with respect to the primary energy absorbing box 2 hence it is necessary to have them sufficiently overlapped preferably the overlap between the bottom 24 and the transverse beam 11 is more than 80 in a preferred embodiment the gap between the bottom 24 and the transverse beam 11 is preferably 8 mm in the crash of a car with a pedestrian the secondary energy absorbing box 5 of the vehicle energy absorbing device according to the present invention can provide continuous stiffness when the primary energy absorbing box 2 is nearly collapsed so as to protect lower legs of pedestrians and reduce harms to legs of pedestrians specifically when a pedestrian collides with the peripheral vehicle parts 7 in a crash the primary energy absorbing box 2 collides with the transverse beam 11 of the front bumper beam 1 and collapses towards the opening 29 under the action of the transverse beam 11 to thereby absorb the collision energy the bottom 24 collides with the secondary.