Wire harness and wire harness manufacturing method

A wire harness comprising:

• a flat wiring member formed in a U shape, the flat wiring member including a first portion having a straight line shape, a second portion having a straight line shape, and an intermediate portion connecting an end of the first portion and an end of the second portion;
• a first case that holds the first portion;
• and
• a second case that holds the second portion,
• wherein the first case and the second case can be engaged with each other in a state where the flat wiring member has a straight line shape,
• the flat wiring member having a straight line shape has a configuration in which the second portion extends on an extension line of the first portion in plan view,
• the flat wiring member having a straight line shape includes a first folded portion and a second folded portion,
• the intermediate portion is folded along a folding line in the first folded portion, the folding line extending in an extending direction in which the first portion extends, and
• the second portion is folded, in the second folded portion, along a folding line orthogonal to the extending direction so as to allow a part of the second portion to overlap with the intermediate portion.