To improve safety severely judging a deserver by collating an inputted person proof data with an identical person certificated data of an IC card to unlatch and by using the IC card wherein the identical person certificated data of users is memorized as a key.

A key card publishing house 1 is provided with a host computer 11, a data input device 12, an input device 13 for a person proof data, and a reader and writer 14 for publishing a key IC card. By a key card publishing house 1, a rental safe is specified, an ID for admitting utilization of the safe and an identical person certificated data of a user acquired with the input device 13 for a person proof data are stored in an IC card, the IC card is published as a key card 2, and the IC card is rented to a user. After a safe deposit box 3 is once locked, only when the person proof data wherein a user himself inputs in the scene is corresponded with the identical person certificated data read from the key card 2 which the user presents within a range admitted in collating theory, the safe is unlatched through an unlatching processor 31. Accordingly, the high safety of holdbacks can be secured.