10 a protruded respectively from the upper and lower sides of the main posts 10 and absorbers such as wire clips not shown may be arranged close to the end or in the middle of the diagonal rope members 22 a mesh member 23 is formed of a mesh net of reticulated high strength fiber such as metallic mesh and aramid fiber or of a plastic mesh net in consideration of the workability and cost a rhombic metallic mesh is preferred as illustrated in fig1 the mesh member 23 is joined in a movable manner to the entire length or a part of the rope members 21 22 by wrapping helical coils and the like around the mesh member 23 and rope members 21 22 the rhombic metallic mesh used for the mesh member 23 inherently has difference in the degree of extensibility between vertical and horizontal directions due to the manufacturing process for this reason when fixing the mesh member 23 between main posts 10 the rhombic metallic mesh should be so arranged as to be rather extended in a horizontal direction than extended in a vertical direction in fig1 in order to achieve the improved capability of mesh member 23 to capture falling rocks a safety net 30 has a length longer than the gap between the guard net 20 and the slope 40 and is formed of a mesh net of reticulated high strength fiber such as metallic mesh and aramid fiber in consideration of the workability and cost a rhombic metallic mesh is preferred one top end of the safety net 30 is integrally joined to the skirt of the mesh member 23 by wrapping helical coils and the like around the one end and.