An optical measurement apparatus 2 includes: a connector where a base end portion of a measurement probe 3 introduced into a subject is connected a light source unit 20 that emits illumination light irradiated from a leading end of the measurement probe 3 an optical measurement unit 22 that measures reflection light and/or scattering light of the illumination light incident through the measurement probe 3 a first optical path 24 that transmits the illumination light emitted by the light source unit 20 to the optical measurement unit 22 a second optical path 25 that transmits, to the measurement probe 3, the illumination light emitted by the light source unit 20 and transmits, to the optical measurement unit 22, reflection light and/or scattering light of the illumination light incident through the measurement probe 3 and an optical path switching unit 23 that switches an optical path for transmitting the illumination light into the first optical path 24 or the second optical path 25.
