Patent ID: 8670819

Claim:
An optical biological information detecting apparatus, comprising: a light emitting unit which emits observation light of a specific wavelength band to optically observe a desired portion of a tissue of a skin of a human body; an annular light guide unit which is adapted to contact a desired area of a surface of the skin corresponding to the desired portion of the tissue of the skin, which guides the observation light to the desired area of the surface of the skin, and which annularly irradiates the observation light onto the desired area of the surface of the skin; and a light receiving unit which is disposed at a position surrounded by the annular light guide unit, and which receives scattered light scattered by the desired portion of the tissue of the skin after the observation light is annularly irradiated onto the desired area of the surface of the skin by the annular light guide unit, the light receiving unit including an optical filter, a light receiving element and a holder portion which has a light shielding function and in which the light receiving element and the optical filter are disposed to adapt the optical filter to contact a position of the surface of the skin surrounded by the annular light guide unit, and the holder portion shielding light excluding the scattered light toward the optical filter.