Stacker (2) of the paper money processing device (1) is provided with L-shaped levers (4) whose front end (4a) is formed to be orientated upward and which rotatably support auxiliary rollers (5) at the front end (4a), and a thrusting member (6) which thrusts the L-shaped levers (4) toward a paper money carrier belt (26) of the device main body (22) constantly. The stacker (2) is constructed in such a way that, when it is mounted in the device main body (22), a paper money inserted is held and carried between the auxiliary rollers (5) and the paper money carrier belt (26) by the thrusting force of the thrusting member (6), and when the stacker (2) is removed from the device main body (22), a paper money housed within the stacker (2) is prevented from falling down from the stacker (2) by the L-shaped levers (4).