Patent ID: 8470144

Claim:
An electrode device for an electrochemical sensor chip for electrically connecting an analyte to electrodes formed on a surface of a transducer, comprising: an insulation sheet having an insulating property and including a top surface and a bottom surface opposite to each other in a thickness direction; and electrode members having a conductivity and held by the insulation sheet in portions piercing the insulation sheet in a thickness direction, one ends of the electrode members located on the top surface side of the insulation sheet being connected to the analyte, other ends located on the bottom surface side of the insulation sheet being connected to the electrodes of the transducer, recesses for trapping the analyte being formed in the top surface of the insulation sheet so as to correspond to the electrode members, the one ends of the electrode members being exposed at a bottom of the recesses, wherein the recesses have a reversely tapered shape having a larger diameter at a bottom than at an opening that opens at the top surface of the insulation sheet.