Provided is a distance measurement sensor (2) comprising a light emission unit (110) for emitting light onto an object, a light reception unit (120) for receiving light from the light reception unit (110) that has been reflected by the object, and a calculation unit (150) for calculating the distance from the light reception unit (120) to the object on the basis of light reception data acquired from the light reception unit (120). The calculation unit (150) controls user notification processing by comparing prescribed data and light-reception data for detection obtained when the reception unit (120) received light from the light emission unit (110) that was emitted onto a reference object provided at a prescribed distance and reflected by the reference object.
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