The present invention enhances the measurement accuracy of a distance measurement device (method) that uses a laser. A distance measurement method provided with a first step for irradiating multiwavelength laser light; a second step for splitting the multiwavelength laser light; a third step for carrying out photoelectric conversion for each wavelength of measurement light that has been obtained by irradiating, onto a subject, a first beam having undergone the splitting and for detecting the converted measurement light as a measurement signal; a fourth step for carrying out photoelectric conversion for each wavelength of a second beam that has undergone the splitting and is different from the first beam and for detecting the converted beam as a reference signal; and a fifth step for detecting the relative phase between the measurement signal and the reference signal and determining the distance of a measurement light path on the basis of the detected relative phase.
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