Wire harness installation structure

There is provided a wire harness structure which prevents an extraordinary displacement of a wire harness, and immediately discharges water from the wire harness when the water such as rain water splashes on the wire harness so that the freezing of the residing water and undesirable cutting of wires due to the freezing can be prevented. At an extending portion 13c of the wire harness, a strip-like plate spring 27 and the wires 31 are integrally combined together, and are covered with a mesh-like protective member 33 so that water will not reside therein. Even when water such as rain water splashes on the extending portion 13c, the water is discharged through mesh holes of the protective member 33, and will not reside in the extending portion 13c. Therefore, the freezing of the residing water can be prevented, and the cutting of the wires 31 can be prevented from occurring.