All solid secondary battery, all solid secondary battery structure and preparation method for all solid secondary battery

An all solid secondary battery includes: a stack including positive and negative electrode layers, and a solid electrolyte layer between the electrode layers, the positive electrode layer includes a positive electrode current collector and a positive electrode active material layer thereon, the negative electrode layer includes a negative electrode current collector and a first negative electrode active material layer thereon, and the first negative electrode active material layer does not contain a solid electrolyte or an amount of the solid electrolyte contained in the first negative electrode active material layer is 3 wt % or less; and an exterior casing material for accommodating and sealing the stack, the exterior casing material includes a first exterior casing material on a first surface of the stack, and a second exterior casing material on the second surface of the stack, and the first exterior casing material includes a cushioning layer.