Provided is a binder composition for an all-solid-state secondary battery with which it is possible to form a solid electrolyte-containing layer that can cause an all-solid-state secondary battery to display excellent high-temperature cycle characteristics. The binder composition for an all-solid-state secondary battery contains an acrylic polymer and not less than 500 mass ppm and not more than 20,000 mass ppm of a phosphoric acid ester emulsifier relative to the acrylic polymer.
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