is an example of a spiral rope having a single layer or several layers and each of which is composed of a plurality of the wires the rope 1 is obtained by twisting the wires each other the spiral rope is formed by twisting six wires 3 defining a first layer arranged around a core wire 2 and twisting twelve wires 4 defining a second layer arranged around the first layer the superior corrosion resistance steel wires are used for the wires 4 of the second layer a rope 5 shown in fig2 is the same that of fig1 except that the superior corrosion resistant steel wires are used for not only wires 7 of the second layer but also the wires 6 of the first layer a rope shown in fig3 has so called a 7 u00d7 7 construction that is a core strand 9 is defined by stranding six side wires 11 arranged around a core wire 10 a side strand 12 is defined by stranding six side wires 14 arranged around a core wire 13 and a stranded rope is obtained by closing the six side strands 12 arranged around the core strand 9 besides the superior corrosion resistant steel wires are used for the side wire 14 of the side strand 12 a rope 15 shown in fig4 is the same as that of fig3 except that the superior corrosion resistant steel wire is used for.