<p>: A V belt to be used for frictional power transmission comprises at least one endless load carrier with teeth at the underside thereof and a plurality of blocks with slots in which the load carrier is fitted. The load carrier and the blocks engaged each other in the lengthwise direction of the belt by engagement of a curved convex surface of a slot under-surface of the block with a curved concave part which is a valley between adjoining teeth of the load carrier. The tooth peaks of the load carrier are positioned above the lowermost end position of the slots of adjoining blocks when the belt extends rectilinearly.</p>
