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 that irradiation light existing 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 firs 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.
