The purpose of the present invention is to provide a binder composition for a secondary cell with which it is possible to form a functional layer having an excellent adhesive performance with respect to a substrate. This binder composition for a secondary cell includes an adhesive polymer and a solvent, wherein the viscosity in a condition of a solid content concentration of 5.0 mass% is 50 mPa ⋅ s or higher, and the viscosity of a fraction having a light transmittance of 65% or below, obtained by centrifugal separation in a condition of a solid content concentration of 5.0 mass% , is 30 mPa ⋅ s or higher.
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