Abstract: A mudguard is provided for a bicycle of the type with a brake reinforcing plate which is mounted to a seat stay of the bicycle by a fixing device. The mudguard includes an elongate shell which is arc-shaped in section and has a front end and a rear end. A recess is formed along a longitudinal direction of an underside of the shell. A slot is formed along a transverse direction of the front end of the shell and defines a first panel and a second panel which are parallel to each other. The first panel and the second panel are engaged on the brake reinforcing plate with the brake reinforcing plate at least partially received in the slot. A pair of grooves are formed in a mediate portion of the second panel and extend downwardly, and thus define a flexible snap fastener which has a hook end in a distal end thereof for engaging with an underside of the brake reinforcing plate and for securing the mudguard to the brake reinforcing plate.