Patent ID: 8668234

Claim:
A bumper beam, which is configured to be mounted on the front or rear of a vehicle body and to extend along a reference line, comprising: a beam body formed of a metallic plate and extending along the reference line; and a metallic first reinforcing plate extending along the reference line and attached to said beam body, wherein in at least one cross section perpendicular to the reference line, said first reinforcing plate extends linearly, and said beam body includes a pair of swelled parts, each swelled part being formed to extend from said first reinforcing plate in an intersecting direction while enclosing an internal space, and wherein said beam body and said first reinforcing plate satisfy the following condition: ( E st /ρ st 3 )<( E 2 /ρ 2 3 ) wherein E st : Young's modulus of said beam body ρ st : Density of said beam body E 2 : Young's modulus of said first reinforcing plate ρ 2 : Density of said first reinforcing plate.