A method for producing a laminated all-solid-state battery 100, including: housing an all-solid-state battery laminate 15, having one or more all-solid-state unit cells, in a casing 20 composed of a laminated film 21, the one or more all-solid-state unit cells obtained by laminating a negative electrode current collector layer having a negative electrode current collector tab 1a, a negative electrode active material layer, a solid electrolyte layer, a positive electrode active material layer and a positive electrode current collector layer having a positive electrode current collector tab 5a in this order, pressing the all-solid-state battery laminate 15 housed in the casing 20 in the direction of lamination from outside the casing 20, injecting a filler into the casing 20 while maintaining pressure, and sealing the casing 20.