A process for producing a conductive composition for a biological electrode wherein casting or injection is preformed while maintaining the flowability of the feedstock solution to thereby enable the molding of the solid gel into a desired shape. A process for producing a conductive gel composition for a biological electrode having a function of electrically and physically connecting a living body to an electrode element and comprising at least the following components: (1) a radical-polymerizable unsaturated compound; (2) an acid reacting with NaOH or KOH to thereby give a reaction product which is a moisturizer serving as a plasticizer and having a function of supplementing and promoting the physiological humidifying function of the horny layer; (3) water; (4) NaOH and/or KOH; (5) a photopolymerization or light polymerization initiator; and (6) a crosslinking agent. which comprises preparing a first solution containing at least the components (1) and (2) and a second solution containing at least the components (3) and (4) independently, mixing the first and second solutions and then subjecting the resulting mixture to irradiation with light or heating.