Abstract: A sample loading bottom plate (300,600, 810, 820, 831) and an immunochromatography detection apparatus (10) containing the sample loading bottom plate (300, 600, 810, 820, 831). During design of the sample loading bottom plate (300, 600, 810, 820, 831), a sample loading portion (310, 833) having a multistage-step structure is additionally provided on a sample loading region and comprises multistage steps having different heights, wherein a base surface (311) is used for carrying a sample solution.

Abstract: The present invention relates to an immunochromatographic assay device, comprising: a cover plate; an immunochromatographic assay kit; and a sample loading pad. A wet zone is defined by the cover plate and at least part of a sample loading portion of the sample loading pad disposed close to an installation position of the immunochromatographic assay kit. The height of the wet zone satisfies the following condition: when flowing into the wet zone, a sample solution is driven by capillary action to flow from a surface of the sample loading portion toward the immunochromatographic assay kit.