Patent ID: 7771575

Claim:
An analytical tool comprising: a substrate; a cover stacked on the substrate via a spacer; a capillary formed between the substrate and the cover, the capillary including an introduction port for taking a sample liquid into the capillary; a stepped portion projecting from the substrate for preventing the sample liquid in the capillary from moving further; and a reagent portion provided in the capillary between the introduction port and the stepped portion; wherein the stepped portion is greater in height with respect to the substrate than the reagent portion, wherein the cover is formed with an air vent hole for discharging air from the capillary when the sample liquid moves in the capillary, wherein the stepped portion is located at a position corresponding to an edge portion of the air vent hole for preventing the sample liquid in the capillary from moving beyond the edge portion to flow out through the air vent hole.