To provide a corrugated steel sheet for a guard rail capable of solving such a problem that a body steel sheet is caught in the guard rail side by a collision accident of a vehicle, stripped off, and remains at the guard rail side.

In the lengthy corrugated steel sheet forming projections in upper and lower parts and a recess in a central part, notches 2 having a width of 3 cm to 6 cm and a length of 10 cm to 22 cm toward the inside from one end or both end edges of the steel sheet are formed at the projections in upper and lower parts, grooves 3 with the same dimensions are formed between the central recess and both the up-and-down projections, three strips of paper bands 4 are thereby formed of both the up-and-down corrugated type projections and the central recess, at the same time, a bolt hole 6 is formed in the vicinity of the end edge of each of the strips of paper bands 4, on the other hand, nut bodies 8 are mounted to back sides of both up-and-down bolt hole places, both the up-and-down strip of paper bands except the central strip of a paper band are bent in a U-shape toward the inside in a boundary by holding the notch 2 and a fillet of the groove 3, and, a bolt hole 7 is formed in the central recess place corresponding to the nut bodies 8 of both the bent up-and-down strips of paper bands.