The invention relates to an absorber (10), comprising first and second portions (12, 14), and at least partially made of plastic material, wherein: - the first portion comprises a first support wall (16) extending in a longitudinal direction of the absorber and placed in abutment against a beam of the vehicle (11), the second portion comprises a second support wall (22) extending in a longitudinal direction of the absorber and substantially perpendicular to the first wall, placed in abutment against the beam, - the second portion comprises reinforcing walls (23) substantially corresponding to a plane normal to the longitudinal direction of the absorber and arranged to each comprise an end connected to the second wall, each reinforcing wall comprising at least one other end connected to an adjacent reinforcing wall, so that each reinforcing wall is connected to each of the adjace walls; nt.
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