Provided is a measurement probe that can make measurements with higher accuracy while promoting a reduction in the diameter. A measurement probe 3 includes an illuminating fiber 311 that applies illumination light to a living tissue S1, a plurality of light receiving fibers 312 that receive, at different positions, the backscattering light which is applied by the illuminating fiber 311 and backreflected and/or backscattered from the living tissue S1, and a cylindrical support section 34 that makes the distance between distal ends of the illuminating fiber 311 and the plurality of light receiving fibers 312 and the living tissue S1 constant and permits the illumination light to pass through at least a part of a side surface thereof. An illumination area D1 of the illumination light applied by the illuminating fiber 311 on the living tissue S1 is larger than the area of the cross section of a distal end of the support section 34.
