Abstract: A security device is provided with a plurality of detectors for detecting a person, and controls the security status of a security target, the security device being provided with: a detection sequence comparison unit which performs a comparison to determine whether the sequence in which the person was detected by the detector coincides with a prestored detection sequence that is performed by the detector and associated with the security setting status or security cancellation status; and a control unit which controls the security status of the security target from the security cancellation status to the security setting status, or controls the security status from the security setting status to the security cancellation status, if the result of the comparison by the detection sequence comparison unit indicates that the sequence in which the person was detected by the detector coincides with the detection sequence performed by the detector.