Position sensor

A position sensor, comprising:

• a detecting circuit including a magnet configured to generate a bias magnetic field and a detection circuit to which the bias magnetic field is applied, and configured to generate a detection signal corresponding to a plurality of ranges aligned in one direction along a moving direction of a detection body based on a change in the magnetic field constantly received by the detection circuit from the detection body made of a magnetic material as the detection body moves;
• and
• a signal processing circuit configured to acquire a detection signal from the detecting circuit, compare the detection signal with a threshold value, and identify a position of the detection body as a position of any one of a plurality of ranges based on a combination of a magnitude relationship between the detection signal and the threshold value,
• wherein
• the detection body has a plurality of region portions corresponding to the plurality of ranges,
• the plurality of region portions are configured to be connected stepwise in the moving direction of the detection body within a plane of a detection surface facing the detecting circuit of the detection body,
• when the detection body is missing, the signal processing circuit determines a missing of the detection body by acquiring a detection signal obtained by not receiving any influence of the magnetic field from the detection body, and
• the detection circuit is a circuit whose resistance value changes based on the change in the magnetic field received from the detection body as the detection body moves.