An immunochromatographic kit for detecting a test substance in a specimen liquid, comprising: an inspection strip that includes an insoluble carrier spreading the specimen liquid, a label-holding pad including a label substance modified with a first substance bondable to the test substance fixed on the insoluble carrier, a liquid-sending pad in contact with one end of the insoluble carrier and sending a first amplification liquid to the insoluble carrier, and an absorption pad in contact with another end of the insoluble carrier, and the inspection strip sequentially having an inspection region (L 1) including a second substance bonded to the test substance, a confirmation region (L 2) including a substance bondable to the first substance, and an amplification index region (L 3) including a substance that reacts with the first amplification liquid from a label-holding pad side between the label-holding pad and the absorption pad of the insoluble carrier; a first pot disposed below the liquid-sending pad and enclosing the first amplification liquid; a second pot disposed above the absorption pad and enclosing a second amplification liquid; and a housing case containing the inspection strip, the first pot, and the second pot and having a pore for dropwise addition of the specimen liquid facing the label-holding pad, wherein each of the first pot and the second pot has one surface including a sheet member (43, 53), wherein the surface including the sheet member of the first pot is disposed against the liquid-sending pad, wherein a movable member is disposed at a location facing the sheet member of the first pot through the liquid-sending pad and presses and displaces the liquid-sending pad in response to an external pressing force to break the sheet member of the first pot and press the liquid-sending pad into the first pot, and wherein the immunochromatographic kit further comprises a movement prevention mechanism restricting movement of the movable member toward an original position side after pressing the liquid-sending pad into the first pot. an inspection strip that includes an insoluble carrier spreading the specimen liquid, a label-holding pad including a label substance modified with a first substance bondable to the test substance fixed on the insoluble carrier, a liquid-sending pad in contact with one end of the insoluble carrier and sending a first amplification liquid to the insoluble carrier, and an absorption pad in contact with another end of the insoluble carrier, and the inspection strip sequentially having an inspection region (L 1) including a second substance bonded to the test substance, a confirmation region (L 2) including a substance bondable to the first substance, and an amplification index region (L 3) including a substance that reacts with the first amplification liquid from a label-holding pad side between the label-holding pad and the absorption pad of the insoluble carrier; a first pot disposed below the liquid-sending pad and enclosing the first amplification liquid; a second pot disposed above the absorption pad and enclosing a second amplification liquid; and a housing case containing the inspection strip, the first pot, and the second pot and having a pore for dropwise addition of the specimen liquid facing the label-holding pad, wherein each of the first pot and the second pot has one surface including a sheet member (43, 53), wherein the surface including the sheet member of the first pot is disposed against the liquid-sending pad, wherein a movable member is disposed at a location facing the sheet member of the first pot through the liquid-sending pad and presses and displaces the liquid-sending pad in response to an external pressing force to break the sheet member of the first pot and press the liquid-sending pad into the first pot, and wherein the immunochromatographic kit further comprises a movement prevention mechanism restricting movement of the movable member toward an original position side after pressing the liquid-sending pad into the first pot.