An object of the present invention is to provide a sulfide solid electrolyte with excellent ion conductivity and a method for producing a crystallized glass contained in the sulfide solid electrolyte. Disclosed is a sulfide solid electrolyte comprising a crystallized glass represented by the following chemical formula (1):
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒyLi 2 S·(100-x-y)P 2 S 5 ·xP 2 O 5 €ƒ€ƒ€ƒ€ƒ€ƒ(1)
wherein 0<x<25 and 67<y<80.
