A paper sheet processing apparatus capable of preventing an action of drawing out a paper sheet such as a bill is provided. A bill processing apparatus of the present invention has an insertion slot into which a bill is inserted and a traveling route through which the bill inserted into the insertion slot is conveyed. The traveling route has a first traveling route (3A) connected to the insertion slot and a second traveling route (3B) extending downstream from the first traveling route (3A) and being inclined relative to the first traveling route (3A). The second traveling route (3B) is provided with a shutter member (200) for preventing conveyance of the bill toward the insertion slot.