NOVELTY - A solid-electrolyte sulfide material comprises element (A) comprising bivalent element, element (B') chosen from phosphorus, antimony, silicon, germanium, tin, boron, aluminum, gallium and niobium and sulfur element, and has peak (A') at position of 2( theta ) of 29.58 degrees plus minus 0.5 degrees in X-ray diffraction measurement using copper-potassium ( alpha ) radiation, and does not have peak at position of 2( theta ) of 27.33 plus minus 0.5 degrees or slightly has peak (C) at position of 2( theta ) of 27.33 plus minus 0.5 degrees and ratio of diffraction intensity of peak (C) and diffraction intensity of peak (A) of less than 0.5.    USE - Solid-electrolyte material is used for battery (claimed) e.g. lithium battery. Uses include but are not limited to video camera, mobile telephone, communication apparatus, electric vehicle and hybrid vehicle.    ADVANTAGE - The solid-electrolyte material has excellent lithium ion conductivity. The battery provided using solid-electrolyte material is economical and safe, and has high energy density.    DETAILED DESCRIPTION - A solid-electrolyte sulfide material comprises element (A) comprising bivalent element chosen from lithium, magnesium, calcium and zinc, element chosen from phosphorus, antimony, silicon, germanium, tin, boron, aluminum, gallium, indium, titanium, zirconium, vanadium and niobium and sulfur element, and has peak (A') at position of 2( theta ) of 29.58 degrees plus minus 0.5 degrees in X-ray diffraction measurement using copper-potassium ( alpha ) radiation, and does not have peak at position of 2( theta ) of 27.33 plus minus 0.5 degrees or slightly has peak (C) at position of 2( theta ) of 27.33 plus minus 0.5 degrees and ratio of diffraction intensity of peak (C) and diffraction intensity of peak (C) of less than 0.5. The substitution amount ( delta )(%) of bivalent element exists in the range which shows lithium ionic conductivity of more than ( delta ) of 0 in 0 degrees in which substitution amount ( delta )(%) is calculated using relation of formula: 2(molar fraction of bivalent element in element (A)/molar fraction of lithium in element (A))x 100. INDEPENDENT CLAIMS are included for the following:    (1) battery; and    (2) manufacture of solid-electrolyte material.