A paper sheet storing mechanism (for example, a banknote storing mechanism (32)) includes an image capturing unit (60) that can capture an image of an inside of a storage bag (for example, a banknote storage bag (34)) held by holding unit (for example, holding members (36)), and a control unit (50) that determines a storing state of a paper sheet in the storage bag based on the image of the inside of the storage bag captured by the image capturing unit (60).
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