A wire harness routing apparatus includes: a wire harness arranged between a base portion provided in a vehicle and a seat that is provided so as to be able to rotate with respect to the base portion; a case that can rotate together with the seat while accommodating the wire harness; and a base-side fixing portion that fixes, to the base portion, an end portion of the wire harness pulled out toward the base portion from the case, and that can rotate relative to the case accompanying rotation of the seat. The case includes a first accommodation portion that is arranged inside of a range of a rotational path on which the base-side fixing portion rotates relative to the case, and a second accommodation portion that is provided bulging from a portion that is different from the range of the rotational path on which the base-side fixing portion rotates.