An optical probe has, independently, an irradiation light guide path that irradiates irradiation light and a received light guide path for acquiring radiated light, and efficiently acquires the radiated light to be measured. The probe (10) has a first optical fiber (1) that configures the irradiation light guide path for guiding the irradiation light, which is independent from a second optical fiber (2) that configures the received light guide path for acquiring the radiated light from the living body. It also has a condensing lens (3) that receives the irradiation light exiting the first optical fiber and emits same on the side of the area to be measured and receives radiated light radiated from the area to be measured and concentrates same on the side of the first and second optical fibers. The central axis of the exit end of the first optical fiber is deviated and/or inclined with respect to the optical axis of the condensing lens, moving reflected light at the condensing lens surface away from the center of the light-receiving end of the second optical fiber while moving radiated light concentrated by the condensing lens closer to the center of the light-receiving end of the second optical fiber.La présente invention concerne une sonde optique qui a, indépendamment, un chemin de guide de lumière dirradiation qui irradie une lumière dirradiation et un chemin de guide de lumière reçue pour lacquisition dune lumière rayonnée, et acquiert efficacement la lumière rayonnée à mesurer. La sonde (10) a une première fibre optique (1) qui configure le chemin de guide de lumière dirradiation pour guider la lumière dirradiation, qui est indépendante dune deuxième fibre optique (2) qui configure le chemin de guide de lumière reçue pour lacquisition de la lumière rayonnée depuis le corps vivant. Elle comprend en outre une lentille convexe (3) qui reçoit la lumière dirradiation sortant de la première fibre optique et émet celle-ci sur le côté de la zone à mesurer et reçoit la l
