Wire harness

A wire harness comprising:

• a group of first electric wires connected to a first circuit;
• and
• a group of second electric wires connected to a second circuit whose consumption current is smaller than that of the first circuit, wherein:
• the group of first electric wires include copper electric wires and aluminum electric wires, and
• the group of second electric wires include a large diameter electric wire having a conductor formed of aluminum or aluminum alloy, a small diameter electric wire having a conductor formed of copper or copper alloy and a cross-sectional area of the conductor thereof smaller than that of the large diameter electric wire, and an extra fine electric wire having a conductor formed of copper or the copper alloy and a cross-sectional area of the conductor thereof smaller than that of the small diameter electric wire,
• wherein, in the group of the second electric wires:
• the large diameter electric wire has a conductor formed of aluminum or aluminum alloy and a cross-sectional area of the conductor thereof is larger than 0.3 mm2,
• the small diameter electric wire has a conductor formed of copper or copper alloy and a cross-sectional area of the conductor thereof is 0.3 mm2, and
• the extra fine electric wire has a conductor formed of the copper or copper alloy and a cross-sectional area of the conductor thereof is smaller than 0.3 mm2.