A paper sheet insertion apparatus (for example, depositing and dispensing unit 20) includes: an imaging unit (for example, camera 60) configured to take an image of a side edge portion, on a placement member 23a side, of paper sheets placed in a placement unit 22, or a side edge portion, on a side opposite to the placement member 23a side, of the paper sheets placed in the placement unit 22, to obtain image data; and a control unit (for example, depositing and dispensing unit control unit 72) configured to determine, based on the image data obtained by the imaging unit, whether or not a plurality of the paper sheets placed in the placement unit are bundled by a bundling member.