PURPOSE: To eliminate the need to provide a flame detection, a smoke sensor. etc., separately from the human body detecting device when abnormality detection for fire occurrence is performed in addition to human body detection.

CONSTITUTION: An abnormal temperature detection processing judgement part 42 which detects abnormal temperature variation due to a fire, etc., according to the detection signal outputted from an infrared detecting element 1 is provided separately from a human body detection processing judgement part 41 and when the abnormal temperature detection processing judgement part 42 detects abnormal temperature variation, a signal different from the one when the human body detection processing judgement part 41 detects a human body is outputted to the outside.