[Problem] To provide a wire harness allowing a relatively large number of electrical wires to be passed under the floor of a vehicle body.[Means for Solving Problem]A wire harness 21 is provided with a plurality of high-voltage electrical wires 22, a protection member 23 which protects the high-voltage electrical wires 22, fixed members 24, 25 which fix the wire harness in a vehicle, and a low-voltage electrical wire 26. The protection member 23 has two protection members for body under floor 29 and a body under floor protection member 30. The protection members thereof are flat-corrugated tubes. In the two protection members for body under floor protection member 29, circuits 22a, 22b which have the plurality of high-voltage electrical wires 22 are respectively received. Also, in the protection member 30 for body under floor, a circuit 26a which has the low-voltage electrical wire 26 is received. The two protection members 29 and the protection member 30 are arranged side by side.