Abstract: A front body section of a vehicle which is provided with a front-side member and a crush box. The crush box includes a front section and a rear section, which are disposed in front of the front-side member so as to be axially aligned and connected thereto. An upper plate, a lower plate, an outer plate, and an inner plate, all of which form the front section, are prepared so as to provide a lower level of total plastic characteristic, when under load, than those plate members which form the rear section. The crush box thereby exhibits a total plastic characteristic, when under load, in two stages.