Patent ID: 8343427

Claim:
A biosensor for qualitatively or quantitatively measuring a target analyte contained in a specimen solution, the biosensor comprising: an electrode sensor unit including an electrode-unit forming substrate having an insulating property, an electric conductive layer provided on the electrode-unit forming substrate, and an electrode portion formed on the electrode-unit forming substrate for detecting an electrochemical signal; a chromatographic sensor unit including an extended-portion forming substrate having an insulating property and an extended layer disposed on the extended-portion forming substrate for extending a specimen solution by a capillary flow; a specimen solution supply portion for receiving the specimen solution, the specimen solution supply portion being provided at one of (a) a point facing the electrode portion and the extended layer and (b) a point communicating with the electrode portion and the extended layer; and a reagent portion provided at at least one point of the electrode sensor unit, the extended layer of the chromatographic sensor unit, and the specimen solution supply portion, wherein the electrode sensor unit and the chromatographic sensor unit are stacked, and wherein the extended-portion forming substrate is interposed between the electric conductive layer of the electrode sensor unit and the extended layer of the chromatographic sensor unit.