An optical measurement apparatus 2 includes: a calibration member 41 serving as an irradiation target of illumination light when a calibration process is performed for the optical measurement apparatus 2 and a measurement probe 3 a casing member 42 including an insertion portion 42a where a leading end of the measurement probe 3 can be inserted, a housing portion 42b that communicates with the insertion portion 42a and accommodates the calibration member 41 movably along a penetration direction of the insertion portion 42a, and an opening 42c that communicates with the housing portion 42b and holds at least a part of a switch unit 25 where a manipulation force is added, the casing member 42 being arranged relative to the switch unit 25 such that a manipulation forces is added to the switch unit 25 when the calibration member 41 reaches a predetermined position in the housing portion 42b by insertion of the measurement prove 3 through the insertion portion 42a and a control unit 27 that performs control for initiating the calibration process when a power supply 21 is activated.
