To provide a paper sheet accumulation device accumulating the paper sheets conveyed in an erected posture at high speed without disturbance in conveying attitude.

A section control part turns gates G1, G2 to a right side and conveys the paper sheets Pn conveyed in an arrow E1 direction as shown in Fig. to an arrow E2 direction as shown in Fig. The paper sheets Pn conveyed in the arrow E2 direction as shown in Fig. are conveyed along an accumulation guide 72 and are pushed in a direction of a backup plate 71 by a screw S. At this time, the paper sheets are led to a side wall 76 by pushing rollers 73, 74 and are accumulated on the paper sheets Pn-1 accumulated before. At this time, since the paper sheets Pn pushed by the pushing roller 73 is not brought into contact with the stationary accumulation guide 72 by providing the pushing roller 74 in a downstream of the pushing roller 73, the paper sheets are accumulated without disturbing the conveying attitude of the paper sheets Pn.