To provide a
toothed belt that is highly productive, economical, and has excellent resistance to tooth breakage. [Solution] A
toothed belt 1 comprises a back portion 1c in which a core wire 5 extending along the circumferential direction of the belt is embedded, and a plurality of teeth 1a formed on the inner circumferential surface of the back portion 1c at intervals in the circumferential direction of the belt, the back rubber layer 6 forming the back portion 1c, a tooth rubber layer forming the teeth 1a, a tooth cloth formed on the surface of the teeth 1a, and an
adhesive rubber layer interposed between the tooth rubber layer and the tooth cloth, wherein the
adhesive rubber layer comprises a crosslinked product of a first rubber composition containing a first
polymer component and silica. The first
polymer component comprises a first
ethylene-α-olefin
elastomer, and the proportion of silica is 50 to 130 parts by
mass per 100 parts by
mass of the first
polymer component. The tooth rubber layer and the back rubber layer 6 comprise a crosslinked product of a second rubber composition containing a second
ethylene-α-olefin
elastomer. The rubber
hardness of the crosslinked product of the first rubber composition is greater than the rubber
hardness of the crosslinked product of the second rubber composition.