Optical interference measurement device

An optical interference measurement device comprising:

• an optical division unit that divides light into measurement light and reference light, the light being emitted from a low coherence light source and adjusted at equal frequency intervals;
• and
• an interference light detection unit that detects interference light in which reflected light from a measurement target and the reference light are multiplexed,
• wherein
• a distance from a zero point to the measurement target is set within a range from a first distance to a second distance,
• the zero point is a point at which a signal optical path length of signal light that is the measurement light coincides with a reference optical path length of the reference light,
• the first distance is obtained by subtracting a measurable range determined by an optical frequency resolution of the interference light detection unit from a first value that is an integer multiple of a second value obtained by multiplying a reciprocal of a mode interval of an optical comb generation filter by a light speed, and
• the second distance is obtained by adding the measurable range to the first value.