To provide an endless belt for power transmission, capable of minimizing increase of power loss.

This endless belt for power transmission comprises a carrier 13 that is endless, and a plurality of blocks 14 installed in the circumferential direction of the carrier 13 to get in contact with pulleys 5, 6, 9, and 10. It is provided with a plurality of rolling elements 28 disposed between the carrier 13 and the blocks 14, and positioning mechanisms 15 formed on the blocks 14 to get in contact with the rolling elements 18 for positioning the rolling elements 28 in the width direction of the carrier 13.