Abstract: Disclosure is an underbody for a vehicle. The underbody includes side members formed long at opposite lateral portions of a vehicle body in a longitudinal direction of the vehicle body, and hollow cross members formed long in a transverse direction of the vehicle body, and integrally connected to the two side members.

Abstract: A vehicle body structure includes: a roof side assembly connecting upper ends of pillars of a vehicle body along the forward/backward direction of the vehicle body, the roof side assembly constituting an A-pillar of the vehicle body; and an outer garnish coupled to the outside of the roof side assembly, wherein the roof side assembly includes: a pipe having a closed cross-section shape and elongated in the forward/backward direction of the vehicle body so as to form a closed section; an upper reinforcement member coupled to the upper side of the pipe and elongated in the forward/backward direction of the vehicle body; a lower reinforcement member coupled to the lower side of the pipe and elongated in the forward/backward direction of the vehicle body; and an inner reinforcement member coupled to the vehicle body inner side of the pipe and elongated in the forward/backward direction of the vehicle body.

Abstract: A front bumper system of a vehicle includes a bumper beam disposed on a front end of the vehicle, and the bumper beam has a plurality of openings which are open toward a cooling module disposed within a front compartment of the vehicle. The bumper beam has a plurality of ribs by which the plurality of openings are defined, and each rib has a streamlined cross-section whose thickness gradually decreases from the front of the vehicle toward the rear of the vehicle.