To solve the problem that since it used to be impossible to identify a monitoring object by determining whether the monitoring object is an animal or a human being in a conventional intrusion monitoring device, even when an animal other than a human being as the monitoring object intrudes into a monitoring area, it used to be impossible to discriminate the animal from the human being, and it used to be frequently determined, that is, falsely reported that the monitoring object has intruded.

The intrusion monitoring device includes: a monitoring sensor part for detecting an intruder which has intruded into a monitoring area, and for outputting a monitoring signal; an analysis part for analyzing the frequency components of the monitoring signal output from the monitoring sensor part; and a first determination part for determining the presence/absence of a monitoring object on the basis of the analytic result of the analysis part.