Patent ID: 7550290

Claim:
A sensor comprising: a reaction part, a filtration part, and a supply means, wherein, said reaction part, said filtration part, and said supply means are stacked in this order, said supply means being provided for supplying a liquid sample to said filtration part by capillary action, said filtration part including a filter for supplying a filtered liquid sample to said reaction part, said reaction part having a reagent that reacts with said liquid sample that has been filtered in said filter, said reaction part including a base plate and a plate-like reaction part spacer that are stacked in order, said plate-like reaction part spacer having a cavity inside, said cavity provided with said reagent, said supply means including a plate-like bottom cover, plate-like spacers, and a plate-like top cover that are stacked in order, said plate-like spacers providing a space inside, said plate-like spacers providing at the side faces thereof a first opening and an air vent, each facing to the direction parallel to the surface of said base plate; said plate-like bottom cover having a second opening, said space and said second opening being communicated, the width of said space narrows in the direction from said first opening toward said second opening, seen in planar view, or, the width of said space from said first opening until said second opening is fixed, seen in planar view, so that said liquid sample that is injected from said first opening is directed toward said second opening by capillary action.