The present invention is to provide an immunochromatography method which is capable of performing a detection with high-sensitivity or reduced false-positives by suppressing the occurrence of false-positive when a signal is amplified. An immunochromatography method includes in a state of where a complex of a test substance and a labeling substance containing a metal coupled with a first binding substance for the test substance is formed, developing the complex on an insoluble carrier in presence of a protease hydrolyzate of protein; capturing the test substance and the labeling substance at a detection site of the insoluble carrier containing a material which has a binding property to the first binding substance for the test substance or a second binding substance for the test substance; and detecting the test substance by amplifying the labeling substance captured.