An optical measurement apparatus 1 is an optical measurement apparatus that performs spectrometry on returned light reflected or scattered by a biological tissue 6 and obtains a characteristic value of the biological tissue 6, and includes: a probe 3 having an irradiation fiber 5 that propagates light supplied from a proximal end thereof and emits the light from a distal end thereof, and a plurality of light-receiving fibers 7 and 8, each of which propagates light entering from a distal end thereof and outputs the light from a proximal end thereof and a balloon provided at a distal end 33 of the probe 3 to light-shield a region including a cross section of the probe 3, the cross section being perpendicular to a long axis of the probe 3, the region having an area larger than that of the cross section.
