A routing structure includes a flexible conductive body, a flexible regulating member, a flexible exterior member, and a case. The conductive body has one end fixed to a vehicle body and has the other end fixed to a seat sliding along a rail arranged on the vehicle body. The regulating member extends along the conductive body and regulates a route of the conductive body. The exterior member has the conductive body and the regulating member each inserted therein, and is inserted into the rail. The case is arranged adjacent to the rail, houses parts of the conductive body, the regulating member, and the exterior member on the side of the vehicle body, and absorbs extra lengths of the conductive body, the regulating member, and the exterior member depending on the sliding of the seat.