A negative-electrode active material layer having a line-and-space structure is formed by applying an application liquid containing a negative-electrode active material in stripes on a surface of a negative-electrode current collector using a nozzle-scan coating method and drying the application liquid (Steps S101, S102). Subsequently, by a spin coating method, an application liquid containing a solid electrolyte material is applied (Step S103) and heated at a temperature lower than a glass-transition temperature of the electrolyte material to be dried. Further, an application liquid containing a positive-electrode active material is applied (Step S105) and a positive-electrode current collector is laminated (Step S106) and, then, a laminated body is heated to or above the glass-transition temperature of the electrolyte material to cause the solid electrolyte to flow and adhere to the active material layers.