A measurement probe is configured to be detachably connected to an optical measurement apparatus for optically measuring a living tissue and includes: an illuminating fiber configured to apply illumination light to the living tissue; a plurality of light receiving fibers configured to receive, at different positions, the backscattering light which is applied by the illuminating fiber and backreflected and/or backscattered from the living tissue; and a support section that is substantially cylindrical and configured to make a distance from each distal end of the illuminating fiber and the plurality of light receiving fibers to the living tissue constant, and permit the illumination light to pass through at least a part of a side surface thereof. An illumination area of the illumination light applied by the illuminating fiber on the living tissue is larger than the area of a distal end of the support section.