SOLID ELECTROLYTE COMPOSITION, BINDER PARTICLES, SHEET FOR ALL-SOLID STATE SECONDARY BATTERY, ELECTRODE SHEET FOR ALL-SOLID STATE SECONDARY BATTERY, ALL-SOLID STATE SECONDARY BATTERY, AND METHODS FOR MANUFACTURING SAME

An all-solid state secondary battery including: a positive electrode active material layer; a solid electrolyte layer; and a negative electrode active material layer in this order. At least one of the positive electrode active material layer, the solid electrolyte layer, and the negative electrode active material layer is a layer including an inorganic solid electrolyte having conductivity for ions of metal elements belonging to Group I or II of the periodic table and binder particles which have an average particle diameter of 10 nm or more and 50,000 nm or less and encompass an ion-conductive substance. The binder particles are formed of the ion-conductive substance and a polymer, and the ion-conductive substance is coated with the polymer having a mass ratio of 30% or more and 100% or less of the ion-conductive substance.