Protective structure for vehicles

A protective structure for vehicles, comprising at least one crosspiece (2) externally lined by a bumper strip (3) and attached to a pair of longitudinal side-rails (4) of the chassis of said vehicle by means of a pair of sacrificial elements (5). Said structure also comprises at least one absorption element (10) situated in the space defined by the crosspiece (2), the sacrificial elements (5) and a bottom wall (8) of the vehicle positioned between the two side-rails (4).