PURPOSE: A vehicle bumper beam unit is provided to improve structural stability and collision performance by concentrating stress to a thicker member while head-on collision. CONSTITUTION: A vehicle bumper beam unit(1) comprises a bumper beam(3) and a stay(11). The bumper beam is composed of materials with different thickness. The main body(5) and both sides sub-bodies are coupled with each other for forming the bumper beam. The stay is installed in the rear both sides of the bumper beam and fixes the bumper beam to a vehicle body.
