One embodiment of the present invention provides a ball bearing roller assembly comprising an inner ring having an insertion hole into which a protrusion of a storage body is inserted; an outer ring having a hollow through which the inner ring is inserted, and provided outside the inner ring, at least one ball bearing provide between the inner ring and the outer ring, and in rolling contact with the inner ring and the outer ring; a cover inserted and coupled to a space between the inner ring and the outer ring, and fixing the ball bearing to the outer circumferential surface of the inner ring and the inner circumferential surface of the outer ring and a detachable coupling portion formed to extend from one end portion of the inner ring, and having an insertion space portion into which a vertical wire of the storage body is inserted.