PROBLEM TO BE SOLVED: To provide a catalyst ink composition for a biofuel cell anode, a biofuel cell anode, and a biofuel cell device which are excellent in output and durability and which use a reducing organic material as a fuel at a low cost. Is. A catalyst ink composition for a biofuel cell anode, which uses a reducing organic substance as a fuel, comprising at least a conductive carbon material (A) and a nitrogen-containing heterocyclic compound (B). The catalyst ink composition for a biofuel cell anode, wherein the mass ratio of the conductive carbon material (A) and the nitrogen-containing heterocyclic compound (B) is 5:95 to 99:1. [Selection diagram] None
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