NOVELTY - A solid electrolyte material is sulfide-type solid electrolyte material containing metal (m1), metal (m2), sulfur element and binder comprising polymer having double bond in principal chain. The metal (m1) is lithium, sodium, potassium, magnesium, calcium and/or zinc. The metal (m2) is phosphorus, antimony, silicon, germanium, tin, boron, aluminum, gallium, indium, titanium, zirconium, vanadium and/or niobium. The solid electrolyte material has peak in position of 2( theta ) value of 29.58 plus minus 0.5 degrees measured by X-ray diffraction measurement using copper K alpha -ray.    USE - Solid electrolyte material is used for battery (claimed) for personal computer, video camera and mobile telephone.    ADVANTAGE - The solid electrolyte material has excellent ion conductivity.    DETAILED DESCRIPTION - A solid electrolyte material is sulfide-type solid electrolyte material containing metal (m1), metal (m2), sulfur element and binder comprising polymer having double bond in principal chain. The metal (m1) is lithium, sodium, potassium, magnesium, calcium and/or zinc. The metal (m2) is phosphorus, antimony, silicon, germanium, tin, boron, aluminum, gallium, indium, titanium, zirconium, vanadium and/or niobium. The solid electrolyte material has peak in position of 2( theta ) value of 29.58 plus minus 0.5 degrees measured by X-ray diffraction measurement using copper K alpha -ray, and ratio of diffraction intensity of peak (2( theta )) of 29.58 plus minus 0.5 degrees and diffraction intensity of peak (2( theta )) of 27.33 plus minus 0.5 degrees of less than 0.5. An INDEPENDENT CLAIM is included for battery (20), which has a positive electrode active material layer (11) containing positive electrode active material, a negative electrode active material layer (12) comprising negative electrode active material and electrolyte layer (13). The positive electrode active material layer and/or negative electrode active material layer contains solid electrolyte material.    DESCRIPTION OF DRAWING(S) - The drawing shows the sectional view of the battery.    Positive electrode active material layer (11)    Negative electrode active material layer (12)    Electrolyte layer (13)    Positive electrode collector (14)    Battery (20)