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 storage 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 5,000 mass ppm of a coagulant relative to the acrylic polymer.