NOVELTY - An enzyme electrode having a conductive member (4) and an enzyme (2), where the conductive member has a porous structure, and the enzyme is immobilized through a carrier (3) in pores constituting the porous structure, is new.    USE - For enzyme electrode device used for sensor used as detector for detecting substance such as glucose, fructose, galactose, amino acid, amine, cholesterol, alcohol, lactic acid, oxygen and hydrogen peroxide, fuel cell and electrochemical reactor (all claimed).    ADVANTAGE - The enzyme electrode has excellent electric charge transfer efficiency, stability and enzyme immobilization density, without increase of interspace between enzyme and conductive material.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) an enzyme electrode device comprising the enzyme electrode and wiring connected to the conductive member of the electrode;    (2) a sensor employing the enzyme electrode device as a detector for detecting a substance;    (3) a fuel cell having an anode and a cathode, and a region for retaining an electrolytic solution between them, where at least one of the anode and cathode is the enzyme electrode device;    (4) an electrochemical reactor having a reaction region, and an electrode for causing an electrochemical reaction of a source material introduced to the reaction region, where the electrode is the enzyme electrode;    (5) producing an enzyme electrode by providing a conductive member having numerous voids communicating with each other and with the outside, and a carrier for immobilizing an enzyme for transfer of electrons to or from the conductive member, and immobilizing the enzyme in the voids with immobilization of the carrier in the voids; and    (6) a fuel cell where an anode and a cathode have a porous structure, and at least one of the anode and cathode is an enzyme electrode having an enzyme in pores constituting the porous structure.    DESCRIPTION OF DRAWING(S) - The figure shows the schematic drawing of the enzyme electrode immobilizing enzyme by entrapping.    base plate (1)    enzyme (2)    carrier (3)    conductive material (4)