To provide a new guard rail technology which can alleviate a collision force by elastic deformation, can maintain high durability for many years even in a natural environment, and can effectively save labor for maintenance inspection and maintenance cost.

In the guard rail, a beam 2 which is laid at the vehicular lane-side of a support 1 implanted and self-supported in a site such as a road is arranged in a state of crossing each support 1 and making its backside face the support 1; and a wire rope buffer mechanism 4 which has a plurality of elastic friction loops 51, 51... formed of wire ropes 5 is interposed between the respective supports in such a manner as to carry out regulation so that the elastic deformation of all the loops 51, 51... can be structurally and uniformly regulated and propagated, and integrally connected to the supports 1, respectively.