A wire harness can ensure waterproofness of an exposed conductor portion, and even when at least one of insulated wires is exposed to a high temperature, can suppress loosening of a rubber stopper of a waterproofing terminal. An outer periphery of a region containing an exposed conductor portion and coating material end portions is continuously covered with a protective film. At each of the coating material end portions, a gap between a coating material and the protective film covering the coating material is sealed with a waterproofing agent. At least one insulated wire has a flow path through which gas flows, the flow path being created in gaps between strands that constitute a conductor of the insulated wire and reaching from a coating material end portion opposite to the coating material end portion adjacent to the exposed conductor portion to a splice portion.