A banknote inspection device capable of increasing the accuracy of banknote serial number recognition. In this banknote inspection device (14), a storage unit (23) stores: a first learning model generated using, as teaching data therefor, a character image having a hole; and a second learning model generated using, as teaching data therefor, a character image not having a hole. A serial number recognition unit (24) recognizes characters that form a serial number for a bank note BL, using the first learning model if the character image has a hole and, if the character image does not have a hole, uses the second learning model and recognizes characters that form the serial number for the bank note BL.
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