Electrochemical assay device

An electrochemical assay device comprising:

• an inner flow passage through which a liquid injected from an inlet flows;
• and a liquid absorbing material that absorbs the liquid that has passed through the inner flow passage, and configured to be able to perform an assay based on an electrochemical method, wherein
• the inner flow passage includes a microflow passage that communicates with the inlet and a separating flow passage that is provided between the microflow passage and the liquid absorbing material for separating the liquid inside the inner flow passage into a part to be left in the microflow passage and a part to be absorbed by the liquid absorbing material when the injection of the liquid is stopped, and wherein the inner flow passage is formed by an upper flow passage forming member including an upper wall portion constituting an upper wall of the inner flow passage, a lower flow passage forming member including a lower wall portion constituting a lower wall of the inner flow passage, and an intermediate member functioning as a spacer between the upper flow passage forming member and the lower flow passage forming member being stacked,
• the electrochemical assay device further comprising:
• a plurality of electrode portions separated from each other in a flow direction of the liquid;
• a plurality of connecting portions each provided to be separated from any of the plurality of electrode portions in a width direction perpendicularly intersecting the flow direction of the liquid and connected to an external measurement device;
• and a plurality of conducting wire portions electrically connecting the corresponding electrode portions to the connecting portions, respectively, that are all formed on the lower flow passage forming member or on the upper flow passage forming member,
• when the plurality of electrode portions, the plurality of connecting portions, and the plurality of conducting wire portions are formed on the lower flow passage forming member, the upper flow passage forming member is transparent, and the lower flow passage forming member has a white color or a black color, and
• when the plurality of electrode portions, the plurality of connecting portions, and the plurality of conducting wire portions are formed on the upper flow passage forming member, the lower flow passage forming member is transparent, and the upper flow passage forming member has a white color or a black color.