The invention relates to a solid electrolyte material and a method for producing the same. In order to improve the stability of an electrolyte, an object of the present disclosure is to develop, amongthe sulfide solid electrolytes of Li-P-S-O based containing no metal element other than lithium, a new solid electrolyte having a possibility to have high ion conductivity and a method for producingfor obtaining the same easily. The present disclosure achieves the object by providing a solid electrolyte material including a sulfide composition represented by a composition formula Li4-4y-xP4+1+y-xP5+xS4-zOz (Li4-4y-xP1+yS4-zOz), wherein 0.6<=x<1, 0<=z<=0.2, and -0.025<=y<=0.1.