PROBLEM TO BE SOLVED: To constitute a displacement sensor using a spectrometer.SOLUTION: The displacement sensor for measuring a displacement in a measurement region of a planar measurement object, comprises: a light source unit for irradiating a plane including the measurement region with light of wavelength correspondingly changing with an irradiation direction in an oblique direction to the plane; a spectrometer for measuring a spectral distribution of light reflected from the measurement region; a feature quantity extraction unit for extracting a feature quantity of the spectral distribution; and a displacement calculation unit for calculating a displacement in the measurement region on the basis of the extracted feature quantity and a previously acquired relationship between a feature quantity and a displacement.
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