A wire harness includes power source control boxes, electric wires, and connection wires. The power source control boxes are provided to respective sections. The electric wires connect the power source control boxes to power-requiring devices in the respective sections. The connection wires connect the power source control boxes provided to the respective sections to power-generating devices provided in at least one of the sections to perform power generation different from that performed by a regenerative brake while a vehicle is traveling. The power source control boxes supply electrical energy generated by the power-generating devices to the power-requiring devices in the sections in which the respective power source control boxes are provided.