The proximity sensor (100) includes a light emitting unit (101) that emits light, a light receiving unit (102) that generates a measurement current including an object reflected photocurrent and a non-detection target object reflected photocurrent, and an initial measurement current value. And an initial calibration execution unit (120) that updates an offset value corresponding to the non-detection target object reflected photocurrent based on the measured current value when it is equal to or less than the threshold value.
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