Patent ID: 7173704

Claim:
A measuring device for immunochromatography test piece, comprising: an irradiation optical system for irradiating measurement light onto an immunochromatography test piece, and a detection optical system for detecting reflected light from the immunochromatography test piece under irradiation with the measurement light, wherein said irradiation optical system comprises: a semiconductor light emitting element; a beam shaping member for shaping light from the semiconductor light emitting element, into a beam of a beam section extending in a direction substantially parallel to a colored line formed on the immunochromatography test piece; a lens for focusing the beam from the beam shaping member on the immunochromatography test piece; a first baffle portion of tubular shape for removing stray light, which is disposed between the semiconductor light emitting element and the beam shaping member; a second baffle portion of tubular shape for removing stray light, which is disposed between the beam shaping member and the lens; and a third baffle portion of tubular shape for removing stray light, which is disposed between the lens and the immunochromatography test piece.