Abstract: A canvas of a power transmission belt has an abutting joint part seamed by a sewing machine. A machine sewing thread of the abutting joint part is adhered to the canvas beforehand by adhesive treatment so as not to separate from the canvas. Accordingly, the machine sewing thread does not float off from the canvas at reverse flex. Thus, friction noise and vibration due to interference of the machine sewing thread with a pulley at meshing at reverse flex are prevented.

Abstract: A canvas-rubber complex provided on an upper face of a tension rubber on a back side of V-ribbed belt is composed of a covering canvas, impregnation rubber with which the covering canvas is impregnated, an outer rubber layer which is applied to a first face of the covering canvas which is located on the back face's side of the belt, an inner rubber layer which is applied to a second face of the covering canvas which is the back of the first face, and an adhesion rubber layer disposed on a side of the inner rubber layer for adhering the canvas-rubber complex to the upper face of the tension rubber. Among the rubber elements excepting the adhesion rubber layer, at least the outer rubber layer is formed of a rubber composition including as main ingredients thereof CR polymer, hard carbon and conductive carbon.