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 : a radical - polymerizable unsaturated compound ; 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 ; water ; naoh and / or koh ; a photopolymerization or light polymerization initiator ; and a crosslinking agent . which comprises preparing a first solution containing at least the components and and a second solution containing at least the components and independently , mixing the first and second solutions and then subjecting the resulting mixture to irradiation with light or heating .