Optical probe having, independently, an irradiation light guide path for irradiation light and a received light guide path for acquiring radiated light. A first optical fiber configures the irradiation light guide path, and a second optical fiber configures the received light guide path. A condensing lens receives on one surface irradiation light from the first optical fiber and emits same on the other surface, and receives radiated light radiated from the other surface 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 relative to the optical axis of the condensing lens, moving reflected light at the condensing lens surface away from, and moving radiated light concentrated by the condensing lens closer to, the center of the light-receiving end of the second optical fiber.