Method of manufacturing wire harness

A method of manufacturing a wire harness that includes an electric wire and an electric wire protection tube covering the electric wire, one end side of the electric wire being provided with a large-dimension portion having a dimension larger than an inner dimension of the electric wire protection tube,

• the method comprising mounting the electric wire protection tube on the electric wire via steps, performed in a sequence set forth, of:
• providing a shape-memory polymer having shape-memory properties;
• shaping the shape-memory polymer having said shape-memory properties into a tube shape to form the electric wire protection tube;
• expanding the electric wire protection tube which is heated to a temperature equal to or higher than a glass-transition point such that the inner dimension of the electric wire protection tube becomes larger than the dimension of the large-dimension portion;
• while the electric wire protection tube is in an expanded state, cooling the electric wire protection tube to a temperature below the glass-transition point and solidifying the electric wire protection tube;
• mounting the electric wire protection tube on the electric wire by passing the large-dimension portion and the electric wire inside the electric wire protection tube;
• and
• reheating the electric wire protection tube to a temperature equal to or higher than the glass-transition point such that the electric wire protection tube is restored to the inner dimension obtained after the step of shaping.