A wire harness includes a flat wiring member formed in a U shape, a first case that holds a first portion, a second case that holds a second portion, and a rotating structure. The flat wiring member having a straight line shape includes a first folded portion and a second folded portion. The first folded portion has a configuration in which an intermediate portion is folded back along a folding line in an extending direction of the first portion. The second folded portion has a configuration in which the second portion is folded back along a folding line orthogonal to the extending direction. The rotating structure is configured to form the second folded portion in the second portion by rotating the first case and the second case relative to each other.