Patent ID: 8499794

Claim:
A liquid channel device including a base plate in which a liquid channel through which a liquid which contains at least one of a sample and a reagent, flows, and one or more liquid chambers for holding the liquid are formed to at least one side thereof, and a cover plate which is laminated onto a channel formation surface of the base plate where the liquid channel and the liquid chambers are formed; wherein at least one of the liquid chambers has a liquid transport section for transporting the liquid from an inside to an outside of the liquid chamber; the liquid transport section operated by external pressing on a floor of the liquid chamber or on the cover plate in an area corresponding to the liquid chamber, and wherein the liquid channel device further includes an opening section which opens a portion of the liquid channel from a closed mode, and a closing section which closes a portion of the liquid channel from an open mode; the cover plate has a first base layer which forms a surface of the cover plate, a strongly adhered layer which is formed to an inside of the first base layer, a second base layer which is formed to an inside of the strongly adhered layer, and a weakly adhered layer which is formed to an inside of the second base layer and is adhered to the channel formation surface; in the opening section, a first convex section is formed to the liquid channel, a top part of the first convex section and the weakly adhered layer are adhered, and the strongly adhered layer and the second base layer are separated; in the closing section, a second convex section is formed to the liquid channel, a top part of the second convex section and the weakly adhered layer are separated, and a spacer is interposed between the strongly adhered layer and the second base layer, with the spacer and the strongly adhered layer are adhered together; and in the liquid transport section, a spacer is interposed between the strongly adhered layer and the second base layer, and the spacer and the strongly adhered layer are adhered.