SULFIDE SOLID ELECTROLYTE

The present invention relates to a sulfide solid electrolyte comprising: lithium, phosphorus, sulfur and chlorine, wherein the molar ratio of the chlorine to the phosphorus, c (CI/P), is greater than 1.0 and 1.9 or less, wherein the sulfide solid electrolyte has an argyrodite-type crystal structure, wherein the sulfide solid electrolyte has a peak in each of regions 80.3 to 81.7 ppm, 82.4 to 83.7 ppm and 84.0 to 85.6 ppm in a solid 31P-NMR measurement, wherein an area ratio of the peak in the region of 80.3 to 81.7 ppm to a total area of all peaks in the region of 78 to 92 ppm is 40 % or more.