ACCESS CONTROL DEVICE, KEY DEVICE, AND KEY HOLDER

According to an embodiment, an access control device includes a first communication interface, a second communication interface and a processor. The first communication interface communicates with a key device including key identification information. The second communication interface communicates with a confirmation device that is registered in advance. The processor acquires, from the key device communicating by the first communication interface, an identifier functioning as the key identification information and a biometrics authentication result in which whether a user of the key device is an access right owner of a security device is confirmed by biological information; transmits a confirmation request signal requesting confirmation of an access permission to the confirmation device correlated with the key device by using the second communication interface, when the key identification information of the key device agrees with key identification information of a valid key and when the biometrics authentication result is an authentication failure; and permits access to the security device, upon receiving a confirmation response signal indicative of the access permission from the confirmation device in response to the confirmation request signal.