To provide a stacker device capable of eliminating oblique stacking of paper sheets even when the paper sheet delivered onto a stack table causes oblique stacking, preventing the stack table from lowering beyond necessity due to delay of release of a paper detection sensor, and keeping a position of the uppermost position face of cutform paper sheets stacked on the stack table in a fixed scope to prevent improper stacking.

A control part 21 performs a series of stack putting-in-order operation for lowering the stack table 12 by fixed amount after lifting it by fixed amount and a series of stack position return operation for lowering the stack table 12 by fixed amount after lifting it up to a position where the uppermost position face of cut paper sheet 6 is detected by driving a table driving motor 17 through a motor driver 23 based on detection signals inputted from the paper detection sensor 20.