A wire harness lead-out structure includes a body that includes a containing portion for receiving a wire harness and a corrugated tube covering the wire harness, a lid that is attached to the body to close an upper opening of the body, two completely-fixing ribs that are formed on the body and the lid respectively to be engaged in grooves of the corrugated tube to prevent a movement of the corrugated tube in an axial direction of the corrugated tube, and a provisionally-fixing rib that is formed in a single line on the opposed side walls of the body to be engaged in a single groove of the corrugated tube, and is disposed between the two completely-fixing ribs. The wire harness lead-out structure length required for provisionally fixing a corrugated tube can be reduced and a compact design can be achieved.