Patent ID: 6879399

Claim:
A measuring device for an immunochromatography test piece, comprising an irradiation optical system for irradiating measurement light onto said immunochromatography test piece, and a detection optical system for detecting light from said immunochromatography test piece as a result of irradiation of said measurement light; wherein said irradiation optical system comprises a light-emitting element, and a mixing rod for mixing the light output from said light-emitting element thereinside, and irradiates the light exiting from said mixing rod onto said immunmochromatography test piece as said measurement light; wherein said detection optical system comprises an imaging lens for forming an image of said light from said immunochromatography test piece, and an imaging element disposed in a position where said light from said immunochromatography test piece is formed into an image by said imaging lens, and detects the light transmitted by said immunochromatography test piece by means of said imaging element; wherein said immunochromatography test piece is held in a casing having an observation window; wherein said irradiation optical system irradiates said light emitted from said mixing rod towards said observation window, as said measurement light; and wherein the surface area of the light output face of said mixing rod is set to a larger area than the surface area of said observation window.