A connector holder is capable of minimizing or preventing interference between a wire harness of an installment panel and a vehicle body. A connector holder is provided with a locking portion with a projecting shape that allows it to lock into a cover attachment hole formed in an installment panel. A wire harness is provided with a connector holding portion for holding a connector of the wire harness and a bolt cover portion extending from the connector holding portion. The bolt cover portion is configured to cover a bolt fixed to a vehicle body in a state where the connector holding portion is fixed to the vehicle body. The locking portion is provided on the bolt cover portion.