To prevent the removal of a carrying mechanism structural part for carrying paper sheets such as a belt from a pulley, and to restrict the generation of carbon transference in the case of carrying the paper sheets such as carbon paper.

This device is not provided with a crowning, and provided with a reversing pulley 3 having a flat peripheral surface, a reversing belt 4 forming a carrying route 4a for carrying the paper sheets 2 while pinching them between the peripheral surface of the reversing pulley 3 along that peripheral surface, a position regulating belt 6 brought in surface-contact with the reversing belt 4 and integrally carried with the reversing belt 4 and the carrying belt 5, and a crowning pulley 9 provided at a position with a space from the carrying route 4a near the reverse pulley 3 and formed with a swelled surface for holding the position regulating pulley 6 freely to be transferred.