ALL-SOLID STATE SECONDARY BATTERY AND METHOD OF MANUFACTURING THE SAME

Provided is an all-solid state secondary battery comprising a laminate in which a positive electrode layer, a solid electrolyte layer, and a negative electrode layer are laminated in this order,in which respective areas of the positive electrode layer, the solid electrolyte layer, and the negative electrode layer satisfy [the area of the positive electrode layer] < [the area of the negative electrode layer] ≤ [the area of the solid electrolyte layer],a buffer layer having an area more than the area of the solid electrolyte layer and having a Young's modulus lower than that of each of, the positive electrode layer, the solid electrolyte layer, and the negative electrode layer is provided on either or both of a side of the positive electrode layer opposite to the solid electrolyte layer side and a side of the negative electrode layer opposite to the solid electrolyte layer side, andthe laminate is in a pressurized state through the buffer layer.