To enhance the efficiency in lending/collecting card keys in accommodation facilities.SOLUTION: A machine to check in/out for accommodation facilities according to the present invention can execute check-in processing and check-out processing, and is characterized in that: the check-in processing can execute payment processing and issuing processing; the payment processing can execute payments relating to stays; the issuing processing can issue, after completion of the payment processing, card keys to unlock guest rooms with the number corresponding to the number of lodgers as its upper limit; and the check-out processing can collect the card keys with a maximum number of card keys to be collected determined based on the number of card keys issued at the check-in processing as its upper limit.SELECTED DRAWING: Figure 1
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