A wire harness routing device 11 includes a wire harness 15, a case 16 in which the wire harness 15 is accommodated and which has an opening 30 through which the wire harness 15 can be led out of or into the case, a protector 21 attached to the wire harness 15 that is led out through the opening 30, and an engagement means 22 configured to disengageably engage the case 16 and the protector 21 with each other.