An optical measurement apparatus includes: a light source that supplies illumination light having at least one spectral component an illumination fiber 35 that propagates, to a distal end thereof, light supplied from a proximal end thereof by the light source and illuminates light onto a scattering medium from the distal end light detection fibers 36 and 37, each of the light detection fibers 36 and 37 outputting, from a proximal end thereof, returned light from the scattering medium, the returned light entering from a distal end thereof, the light detection fibers 36 and 37 having distal end positions different from each other in a longitudinal direction a detection unit that detects light output from the proximal end of a first light detection fiber and the proximal end of a second light detection fiber and a measurement unit that measures a property of the scattering medium based on a result of the detection by the detection unit.
