An optical measurement device that comprises an apparatus main element including a light emission aperture, a light emission probe element that includes the optical fibers and that transmits light through it, and the other end of the optical fibers being detachably attached relative to the light emission aperture, and a light block element that blocks the light irradiated from the light emission aperture under the condition in which the light emission probe element connected to the apparatus main element is detached from the light emission aperture.
