A wire harness is provided to include: one or more electric wires; and an ECU which includes a circuit body electrically connected to one ends of the one or more electric wires and a sealing member that seals the circuit body and the one ends of the one or more electric wires. The one ends of the one or more electric wire are electrically connected to at least one of a power line pattern, a GND line pattern and a signal line pattern of the circuit body.