To provide a paper sheet processing device which sets a binding band at an arbitrary position depending on the type of sheets handled.

At first the type of paper sheets PB is set from an operation display to set the position of a left alignment guide 403A suitable for the type. Next one hundred sheets PB gathered and piled in an accumulation chamber are placed on support tables 401A, 401B to be pressed in the arrow B direction in figure. by a right alignment guide 403B. Then the one hundred sheets PB aligned are bound at a binding position with a band K. The guide 403A is structured with a plate-like body positioned to directly cross a long hole. The other end of an arm 405A connected to a fulcrum point positioned at the lower part of the guide 403A is connected to a rotary articulation. By driving the rotary articulation by a driving source capable of controlling a rotating angle such as a pulse motor, the left alignment guide position is set arbitrary.