To provide a production method which can easily obtain a lithium ion conductive solid electrolyte green sheet in which phosphoric acid-based glass powder is uniformly dispersed, and to provide a method for producing a lithium ion conductive solid electrolyte which can be produced at a low cost, is dense and has high ion conductivity.

There is a method for producing a lithium ion conductive solid electrolyte green sheet comprising: a stage where first phosphoric acid-based glass powder and a solvent are mixed, so as to produce first slurry; a stage where the phosphoric acid-based glass powder in the first slurry is pulverized, so as to produce second slurry; a stage where the second slurry is dried, so as to produce second phosphoric acid-based glass powder; and a stage where the second phosphoric acid-based glass powder, an organic binder having a glass transition temperature of -25 to 25°C and a dispersant are mixed with a liquid including water as a solvent, so as to produce third slurry.

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