Sensor for human detection

The invention relates to a passive infrared sensor for the detection of persons, in particular for detecting also small movements of people. Such sensors can be used in motion detectors. In order to reduce the dependence of the sensor sensitivity of the movement direction of a to be detected person is a passive infrared sensor is proposed, in which a plurality of compensated sensor element groups (2) in a sensor array (3) and electrically connected to a signal processing (4) are connected, are arranged, each sensor element group (2) comprises two elements (1, 1 ') having different by 180 DEG preferred directions and sensor element groups (2) offset from each other in that at least four staggered preferred directions result.