Bio-electrode

A bio-electrode comprising an electro-conductive base material and a living body contact layer formed on the electro-conductive base material;

• wherein the living body contact layer is a cured material of a bio-electrode composition comprising:
• (A) an ionic material;
• and
• (C) a metal powder;
• the ionic material (A) being a polymer compound comprising a repeating unit-a having a structure selected from the group consisting of a salt of an ammonium, a sodium, a potassium, and a silver, the salt being one or more of fluorosulfonic acid, fluorosulfonimide, and fluorosulfonamide,
• wherein the repeating unit-a is a repeating unit having a structure shown by the following general formula (1)-4, or a repeating unit shown by the following general formula (2)
• wherein Rf7 represents a fluorine atom, or a linear or branched alkyl group having 1 to 4 carbon atoms, provided that one or more fluorine atoms are contained;
• R13 represents a hydrogen atom or a methyl group;
• X7 represents a single bond, an arylene group having 6 to 12 carbon atoms, or —C(═O)—O—X10—;
• X10 represents a linear, branched, or cyclic alkylene group having 1 to 12 carbon atoms, or a divalent aromatic hydrocarbon group having 6 to 10 carbon atoms, optionally having an ether group, a carbonyl group, or an ester group in X10;
• a7 is a number defined in terms of mole fraction satisfying 0<a7<1.0, and M+ is an ion selected from the group consisting of an ammonium ion, a sodium ion, a potassium ion, and a silver ion.