An object of the present invention is to provide a lithium-ion secondary battery having a low internal resistance, and to provide a binder composition for a lithium-ion secondary battery electrode excellent in both productivity and binding properties. The binder composition for a lithium ion secondary battery electrode of the present invention includes 10 to 80 mass% of a lithium salt (monomer a) of an unsaturated acid, 5 to 40 mass% of an unsaturated acid (monomer b), and α, β-unsaturated nitrile (monomer c). ) A polymer obtained by polymerizing a monomer composition containing 10 to 85% by mass, and a dispersion medium.
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