NOVELTY - A sulfide solid electrolyte material comprises: a glass ceramics containing lithium, element selected from phosphorus, silicon, germanium, aluminum or boron, halogen group and sulfur, where the sulfide solid electrolyte material has peaks at 2 theta of 20.2 degrees and 23.6 degrees in X-ray diffraction measurement with CuK alpha line.    USE - As sulfide solid electrolyte material in lithium solid-state battery (claimed) for electric automobiles or hybrid automobiles.    ADVANTAGE - The sulfide solid electrolyte materials have high Li ion conductivity and are advantageous in realizing higher output of the battery.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) a lithium solid-state battery comprising a positive electrode active material layer containing a positive electrode active material, a negative electrode active material layer containing a negative electrode active material, and a solid electrolyte layer formed between the positive electrode active material layer and the negative electrode active material layer, where at least one of the positive electrode active material layer, negative electrode active material layer, and solid electrolyte layer includes the sulfide solid electrolyte material comprising glass ceramics containing Lil, and the positive electrode active material has a potential of greater than or equal to 2.8 V with respect to Li; and    (2) producing (M1) a sulfide solid electrolyte material involving amorphizing a raw material composition containing Li2S, a sulfide of phosphorus, silicon, germanium, aluminum or boron, and lithium halide to synthesize sulfide glass; and heating the sulfide glass at a heat treatment temperature equal to or more than a crystallization temperature of the sulfide glass to synthesize glass ceramics having peaks at 2 theta of 20.2 degrees and 23.6 degrees in X-ray diffraction measurement with CuK alpha line, where a ratio of the lithium halide contained in the raw material composition and the heat treatment temperature are controlled to obtain the glass ceramics.