Patent ID: 8133742

Claim:
A method for measuring immunochromatographic test strip, wherein light obtained from an immunochromatographic test strip by illumination of measurement light is detected to measure a reaction degree of an antigen-antibody reaction, the method comprising the steps of: sensing a change of optical characteristic at a first position on the immunochromatographic test strip by detecting light from the immunochromatographic test strip while illuminating measurement light on the first position after dropping a sample onto the immunochromatographic test strip; sensing a change of optical characteristic at a second position at a downstream side of the first position on the immunochromatographic test strip by detecting light from the immunochromatographic test strip while illuminating measurement light on the second position; and acquiring an elapsed time from the change of optical characteristic at the first position to the change of optical characteristic at the second position; and measuring the reaction degree of the antigen-antibody reaction at the first position on the basis of the optical characteristic at the first position after elapse of a predetermined time, longer than the elapsed time, from the change of optical characteristic at the first position, wherein the reaction degree is corrected on the basis of a correlation of the elapsed time and the optical characteristic at the first position after the elapse of the predetermined time.