Measuring probe according to the present invention is a measuring probe (3) detachably connected to an optical measuring device (2) for performing optical measurement with respect to a living tissue, comprising: an illumination fiber for irradiating illumination light to a living tissue , A light receiving fiber for receiving return light of illumination light reflected and / or scattered by the living tissue, a pair of or a plurality of pairs of contact detecting electrodes provided at a peripheral portion of a plane through which the tip passes, and two pairs of contact detecting electrodes A straight line passing through the two contact detection electrodes forming a pair passes through the center of gravity of the tip.本発明にかかる測定プローブは、生体組織に対して光学測定を行う光学測定装置(2)に着脱自在に接続される測定プローブ(3)であって、生体組織に照明光を照射する照明ファイバと、生体組織で反射および/または散乱した照明光の戻り光を受光する受光ファイバと、先端が通過する平面の周縁部に設けられ、対をなす二つの接触検出用電極を一対または複数対有する接触検出手段と、を備え、対をなす二つの接触検出用電極を通過する直線は、先端の重心を通過する。
