Provided is a binding structure of a wire routing material which can allow reduction of cost and also provides excellent workability for assembly into a vehicle body when wiring for wire routing materials having different shapes, such as a wire harness and a flat wire routing material, is performed in the vehicle body. A binding structure 1 is formed in which a flexible wire routing material 2 and a plate-shaped flat wire routing material 3 having higher rigidity than the flexible wire routing material 2 overlap each other, and the flexible wire routing material 2 and the flat wire routing material 3 are enclosed in an annular form, bound, and held by a binding portion 45 of an engaging member 4 including an engaging portion 40 for assembly into the vehicle body.