SOLID ELECTROLYTE BODY, ALL-SOLID-STATE BATTERY, METHOD FOR PRODUCING SOLID ELECTROLYTE BODY, AND METHOD FOR PRODUCING ALL-SOLID-STATE BATTERY

Provided is a method for easily producing a thin-membrane solid electrolyte body. A molded body () of a first ceramic is prepared, and the molded body () is fired in a first temperature range to prepare a porous body (). A thin membrane-shaped molded body () composed of a second ceramic containing a solid electrolyte is prepared on at least a part of a surface of the porous body (). A dense body () is prepared by firing the thin membrane-shaped molded body (). As a result, a solid electrolyte body () including the porous body () as a support and the dense body () of a thin membrane-shaped electrolyte integrally formed with at least a part of the surface of the porous body (), is produced.