A method for producing a laminate battery includes: forming a membrane electrode assembly having a multilayer structure including a positive electrode plate, a negative electrode plate and an electrolyte layer, the electrolyte layer being provided between the positive electrode plate and the negative electrode plate, a tab attachment step including joining terminal tabs to end portions of the positive electrode plate and the negative electrode plate of the membrane electrode assembly on an outer packaging material, and covering the membrane electrode assembly with the outer packaging material. Each terminal tab is joined by bending at least a part of the end portion of the outer packaging material in a direction opposite to the membrane electrode assembly, and then joining the terminal tab to the positive electrode plate or the negative electrode plate at a portion corresponding to the bent part of the end portion of the outer packaging material.