In a speaker grille formed of a synthetic resin, including a grille plate having a plurality of through holes and a frame integrally formed with the grille plate so as to surround the outer periphery of the grille plate, a ring-shaped groove is formed between the grille plate and the frame so as to extend along the inner periphery of the frame. In molding the speaker grille, the flow of the resin is blocked by a ring-shaped dam provided in a metal mold to form the ring-shaped groove. Accordingly, the speaker grille can be beautifully molded without the generation of appearance defects such as flow mark, weld, and short. Further, in forming through holes also at the boundary between the grille plate and the frame, there is no problem in strength of the metal mold.