To provide a staple capable of preventing from being loosened even by aged deterioration by driving it in a foam concrete, plaster boards, and plywood to develop high adhering force in a wiring construction using the staple.

This staple for wiring is formed by forming a fork-like shape or a plurality of crotches by cutting from the tips of U-shaped both leg parts, fitting moving pins or washers into the crotches, and forming projected shapes near the tip inside thereof. Thus, the high adhering force can be developed by spreading the staple from the tips of both leg parts by the pin or the washer driven in the foam concrete, plaster boards, and the plywood.