To prevent generation of faulty stack in an stacking part caused by broken deformation, wrinkle, curl and the like are formed in paper sheets without increasing cost in a device for carrying a paper sheet such as banknotes, coupons, recording paper and other paper sheets for providing with a mechanisms for accumulating the paper sheets sequentially carried to.

A straightening mechanism has a pulley 12 having recessed in axial center part of an outer periphery surface and carrying a paper sheet by return along its outer periphery surface and a straightening roller 14 which has an outer periphery surface projected in a recessed part at the paper sheet delivery side and longitudinal direction of the paper sheet is curved along the outer periphery surface by the pulley and then a groove shape deformation part extending over whole length in longitudinal direction is formed in the paper sheet by rolling with the pulley 12 and straightening roller 14.