A toothed belt particularly suitable for use in general industrial machineries includes a cured rubber belt body, a tensile member embedded in the belt body, and a tooth fabric adhered to the surface of teeth of the belt body. The belt body is formed primarily from a vulcanizable rubber composition containing hydrogenated nitrile rubber and zinc polymethacrylate. The zinc polymethacrylate and the hydrogenated nitrile rubber are blended together in a ratio of from 22:78 to 45:55 parts by weight. To the vulcanizable rubber composition, a vulcanizing agent comprised of peroxide and a reinforcer comprised of carbon black are added, and a mixture is vulcanized and pressed or otherwise molded to form the afore-said cured rubber belt body with the tensile member embedded therein. The tensile member is made of high-strength glass fibers. The glass fibers preferably have a resorcin-formalin-latex layer and an overcoat layer both formed thereon.