There is provided a mudguard mounting structure, superior in versatility and capable of reducing the number of steps for mounting. The present invention is a structure for mounting a mudguard on a rear bumper of a vehicle, in which a mounting member is used to mount the mudguard on the rear bumper, said mounting member comprising a clamping portion on one side thereof for clamping an end portion of the rear bumper, and a mounting portion on which the mudguard is mounted on an other side. The mounting member can be mounted on the rear bumper by allowing the clamping portion to clamp the aforementioned end portion, thereby reducing the number of parts and steps for mounting, and costs. Since the mounting member excels in versatility, costs can be further reduced. An engagement portion for engaging the rear bumper is provided on an inner surface of the clamping portion.