Abstract: A friction roller for conveyor, includes: a shaft; a sprocket which is rotatably coupled to the shaft and has a retainer coupled to the front of a sprocket body; and a conveyor roller comprising a plurality of rotating balls which are located among a plurality of rotating protrusions protruding forwardly from a retainer body of the retainer, an inner wheel body which is fixed to the shaft and has the outer circumferential surface coming into contact with the rotating balls, and an outer wheel body which comes into contact with the outer circumferential surfaces of the rotating balls 111 and rotates by the rotation of the rotating balls.