Method for detecting particulate substance using immunochromatography, and kit for same

A method for detecting a particulate substance by immunochromatography, the particulate substance comprising, on its surface, a plurality of substances to be bound containing a first substance to be bound and a second substance to be bound which may be the same or different with respect to each other, wherein the method comprises the steps of:

• (1) contacting on a membrane of a test strip for immunochromatography a sample containing the particulate substance with a first specific binding substance for the first substance to be bound to capture the particulate substance with the first specific binding substance;
• (2) subsequently, after said capturing of the particulate substance, contacting the captured particulate substance with a second specific binding substance for the second substance to be bound to label the particulate substance;
• and
• (3) detecting the labeled particulate substance,
• wherein the first specific binding substance is immobilized on the membrane, and the second specific binding substance is bound to a labeling substance.