An authentication apparatus comprising: an imaging unit configured to image a person around the authentication apparatus; an authentication unit configured to authenticate an individual by using a face image of a person imaged by the imaging unit; and an instruction unit configured to give an instruction for starting authentication, wherein the authentication unit is configured to acquire the face image before the instruction is given by the instruction unit, and perform authentication after the instruction is given by the instruction unit, wherein the imaging unit is configured to capture an image of a person present in a first region, wherein the instruction unit is configured to give an instruction for starting the authentication in a case where a person is present in a second region which is located inside the first region and wherein the second region is disposed on a side closer to the authentication apparatus within the first region, wherein the authentication unit is configured to finish authenticating before the person existing in the second region passes through a face detection limit, the face detection limit being provided on a side closer to the authentication apparatus within the second region and being a limit of a distance at which the imaging unit is configured to acquire the face image suitable for authentication; wherein the authentication apparatus further comprises a notification unit configured to perform a notification of whether or not authentication in the authentication unit has been successful before the person existing in the second region approaches closer to the authentication apparatus than the face detection limit. an imaging unit configured to image a person around the authentication apparatus; an authentication unit configured to authenticate an individual by using a face image of a person imaged by the imaging unit; and an instruction unit configured to give an instruction for starting authentication, wherein the authentication unit is configured to acquire the face image before the instruction is given by the instruction unit, and perform authentication after the instruction is given by the instruction unit, wherein the imaging unit is configured to capture an image of a person present in a first region, wherein the instruction unit is configured to give an instruction for starting the authentication in a case where a person is present in a second region which is located inside the first region and wherein the second region is disposed on a side closer to the authentication apparatus within the first region, wherein the authentication unit is configured to finish authenticating before the person existing in the second region passes through a face detection limit, the face detection limit being provided on a side closer to the authentication apparatus within the second region and being a limit of a distance at which the imaging unit is configured to acquire the face image suitable for authentication; wherein the authentication apparatus further comprises a notification unit configured to perform a notification of whether or not authentication in the authentication unit has been successful before the person existing in the second region approaches closer to the authentication apparatus than the face detection limit.