Patent ID: 7173705

Claim:
A measuring device for immunochromatography test piece comprising: a pedestal on which an immunochromatography test piece is placed; an irradiation optical system for irradiating measurement light toward the pedestal; a detection optical system for detecting light incident from the pedestal side; an optical head on which the irradiation optical system and the detection optical system are mounted; a scanning mechanism for moving the optical head in a predetermined scan direction; and a chassis on which the scanning mechanism is placed; wherein the irradiation optical system and the detection optical system move relative to the pedestal in the predetermined scan direction, wherein the irradiation optical system comprises a semiconductor light emitting element and is placed so that light from the semiconductor light emitting element is irradiated as the measurement light from a direction substantially normal to the pedestal, wherein the detection optical system comprises a semiconductor photodetector provided at an obliquely upward position in a direction crossing the predetermined scan direction, with respect to an irradiation position of the measurement light on the pedestal, and is placed so that the semiconductor photodetector detects obliquely upward reflected light in the direction crossing the predetermined scan direction; wherein the chassis comprises a pair of vertical wall portions located on both sides of the pedestal with the pedestal in between, and a top portion coupled to each of the vertical wall portions, wherein the scanning mechanism comprises a slider block to which the optical head is fixed, a pair of guide rails for guiding the slider block in the predetermined scan direction, and a drive motor for moving the slider block in the predetermined scan direction, wherein the pair of guide rails are fixed to the top portion, and wherein the optical head moves in the predetermined scan direction in a space surrounded by the pair of vertical wall portions and the top portion.