To provide a method capable of manufacturing lithium ion conductive material, which is suitable especially for solid electrolyte for lithium ion secondary batteries, stably and in large quantity.

This invention relates to a manufacturing method of lithium ion conductive material including: (1) a process of melting a composite compound which contains lithium, phosphorus and sulfur as its composition to transform it into glass; and (2) a process of obtaining sulfide glass by rapidly cooling the molten glass, and also relates to the lithium ion conductive material manufactured by the manufacturing method.