Wheel arch structure and assembly method of the same

There is provided a wheel arch structure (1) which is made by connecting a wheel arch protector (6) to a wheel arch (3) formed in an arch shape from an outer panel (4) to a bumper (5), the wheel arch protector including: a protector body which is formed in an arc shape; a plurality of clips (62) which protrudes from a vehicle inner side surface of the protector body; and an engaging claw which is provided at a lower end of the protector body on the bumper side; wherein the outer panel includes a plurality of clip holes (43), each of which is connected to a part of the plurality of clips; and the bumper includes a plurality of clip holes, each of which is connected to the other part of the plurality of clips and an engaging portion which is provided at a lower end of the bumper and with which the engaging claw is engaged.