NOVELTY - Manufacturing battery, comprises: forming first active material layer (12) by applying first application liquid of first active material on surface of base material; forming electrolyte layer (13) on surface of laminated body, which is formed by laminating first active material layer on surface of base material, by applying second application liquid of polymer electrolyte; and forming second active material layer (14) having flat surface opposite to surface touching electrolyte layer by applying third application liquid of second active material on surface of electrolyte layer.    USE - The method is useful for manufacturing battery (claimed) e.g. lithium ion battery.    ADVANTAGE - The method provides a thin, low-cost and high performance all-solid-state battery with high productivity.    DETAILED DESCRIPTION - Manufacturing battery, comprises: forming a first active material layer (12) having a specified uneven pattern by applying a first application liquid containing a first active material on a surface of a base material; forming an electrolyte layer (13) having unevenness substantially in conformity with the uneven pattern on a surface of a laminated body, which is formed by laminating the first active material layer on the surface of the base material, by applying a second application liquid containing a polymer electrolyte after the formation of first active material layer; and forming a second active material layer (14) having a substantially flat surface opposite to a surface touching electrolyte layer by applying a third application liquid containing a second active material on a surface of the electrolyte layer after the formation of the electrolyte layer. An INDEPENDENT CLAIM is also included for a battery comprising a structure formed by laminating: a base material; a first active material layer formed by curing an application liquid containing a first active material and applied to a surface of the base material, and having a surface with a specified uneven pattern; an electrolyte layer containing a polymer electrolyte and having unevenness substantially in conformity with the uneven pattern of a laminated body formed by laminating the first active material layer on the surface of the base material; a second active material layer containing a second active material and having one surface touching the electrolyte layer and substantially in conformity with the unevenness of the electrolyte layer and another surface which is opposite to the one surface and substantially flat; and a current collector layer (15) corresponding to the second active material.    DESCRIPTION OF DRAWING(S) - The figure show a cross-sectional structure of a lithium-ion battery.    Lithium-ion battery module (1)    Negative-electrode active material layer (12)    Solid electrolyte layer (13)    Positive-electrode active material layer (14)    positive-electrode current collector (15)