NOVELTY - Solid state battery production includes obtaining active material slurry, solid electrolyte slurry and current collector slurry; forming active material and solid electrolyte green sheets; laminating solid electrolyte green sheet on one surface of active material green sheet to form a first green sheet group, and forming current collector green sheet layer on other surface of active material green sheet to form a second green sheet group; heating second green sheet group in oxidizing atmosphere; and baking second green sheet group in low oxygen atmosphere at specified baking temperature.    USE - For producing solid state battery for electronic devices.    ADVANTAGE - The method provides a solid state battery having high capacity and less internal resistance. The battery exhibits excellent initial charge/discharge characteristics.    DETAILED DESCRIPTION - Solid state battery production includes:    (A) dispersing active material powder, solid electrolyte powder and current collector powder respectively in a solvent containing binder and plasticizer to obtain active material slurry, solid electrolyte slurry and current collector slurry;    (B) forming an active material green sheet and a solid electrolyte green sheet using the active material slurry and solid electrolyte slurry, respectively;    (C) laminating the solid electrolyte green sheet on one surface of active material green sheet to form a first green sheet group, and forming a current collector green sheet layer on the other surface of active material green sheet using the current collector slurry to form a second green sheet group;    (D) heating the second green sheet group at 200-400degreesC in an oxidizing atmosphere; and    (E) baking the second green sheet group in a low oxygen atmosphere at a baking temperature higher than the heating temperature (preferably 700-1000degreesC) to obtain a laminate (78) including a solid electrolyte layer (78a), an active material layer (78b) and a current collector layer (78c).    DESCRIPTION OF DRAWING(S) - The figure is a schematic vertical cross-sectional diagram of a coin-type battery.    Battery case (71)    Sealing plate (72)    Negative electrode (73)    Lithium ion conductive layer (74)    Disc plate (75)    Springs (76)    Gasket (77)    Laminate (78)    Solid electrolyte layer (78a)    Active material layer (78b)    Current collector layer (78c)