PURPOSE: To control a crime preventing display at the time of 'gone out' or 'come home', and to carry out the crime preventing display corresponding to the opening motion of a door at the time of 'at home' by making different the pattern of a crime preventing display in time between at-home and going-out.

CONSTITUTION: By providing a mode setting means 14, the setting between a gone-out mode and an at-home mode can be switched, further, by a mode classification control means 15 provided in a crime preventing display control part 12, and with the use of a display pattern different in time at every selected mode, the crime preventing display can be carried out. Thus, the crime preventing display is not carried out for the opening motion of the door, etc., by a resident and a person concerned when they are gone out, the crime preventing display can be carried out without giving a delay for an illegal intruder coping with the opening/closing motion of the door, etc., when they are at home, and the preventing effect against illegal invasion by the title crime preventing alarm device can be raised.