A lithium ion conductor and the all-solid-state lithium ion secondary battery

The present invention provides excellent ionic conductivity of the lithium ion conductor used to display and solid-state lithium ion secondary battery, the lithium ion conductor. A lithium ion conductive composition containing a crystal structure represented by formula Li7 + 2xP1-xBxS6 (0 tetrahedron (11) by a lithium ion (30) becomes large, the ion conductive path is expanded . In addition, as the lithium ion conductive support according to an amount of x B is added. Accordingly, to realize an excellent lithium ionic conductor display ion conductivity. By the lithium ionic conductor for a solid electrolyte, an all solid lithium ion secondary achieve high battery characteristics.