SULFIDE SOLID ELECTROLYTE AND ALL-SOLID-STATE BATTERY

An aspect of the present invention is a sulfide solid electrolyte comprising at least one element M selected from the group consisting of Al, Si, B, Mg, Zr, Ti, Hf, Ca, Sr, Sc, Ce, Ta, Nb, W, Mo, and V, and N, and having a crystalline structure, wherein the crystalline structure includes a crystalline structure that has a crystal phase of Li7P3S11, Li4P2S6, or β-Li3PS4, or a first crystalline structure that has diffraction peaks at 2θ = 17.9° ± 0.5°, 19.1° ± 0.5°, 29.1° ± 0.5°, and 29.8° ± 0.5° in X-ray diffraction measurement with a CuKα line.