COLLATING DEVICE

Provided is a collating device capable of suppressing the occurrence of an alarm failure or a false alarm to a low level by taking a result of past collation and image capture environment into consideration. This collating device includes a collation list (34) configured to retain a false alarm list including a registered image, a registered face feature amount, a threshold value serving as a criterion for determining whether alarm activation is performed, and a false alarm person image, a collation list update unit (35) configured to update a threshold value managed by the collation list (34), a collation unit (36) configured to collate an input face feature amount with a registered face feature amount and to obtain a similarity, a comparison unit (38) configured to compare a similarity obtained by the collation unit (36) with a threshold value managed by the collation list (34) and to determine whether alarm activation is performed, and a collation list update unit (35) configured to update a threshold value in the collation list (34) with a user input received by an input receiving unit (41). Consequently, occurrence of an alarm failure or a false alarm can be suppressed to a low level by changing a threshold in consideration of a result of past collation and image capture environment for image capture by an image capture device (2).