An object of the present invention is to provide a catalyst ink material for a biofuel cell anode, which has excellent output and durability and uses a reducing organic material as a fuel at a low cost, a catalyst ink composition for a biofuel cell anode, and a biofuel cell anode. , To provide a biofuel cell device. Kind Code: A1 A catalyst ink material for a fuel cell anode, which uses a reducing organic material as a fuel, and which is composed of a carbon material having a carbon hexagonal net surface as a basic skeleton. The carbon material contains a hetero element and/or a base metal element as a constituent element, and the hetero element and/or the base metal element is doped so as to replace at least a part of the carbon element in the carbon skeleton. A catalyst ink material for a biofuel cell anode that uses a reducing organic material as a fuel. [Selection diagram] None
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