A paper sheet insertion device (e.g., a deposit/withdrawal unit (20)) is provided with: an image capture unit (e.g., a camera (60)) which captures and acquires image data for a lateral edge part of a paper sheet loaded on a loading unit (22), said lateral edge part being either on the side of the paper sheet towards loading members (23a) or on the side away from the loading members (23a); and a control unit (e.g., a deposit/withdrawal unit control unit (72) which assesses whether a plurality of paper sheets loaded on the loading unit are bound together by a binding member on the basis of the image data acquired by the image capture unit..
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