An all-solid-state battery includes: a positive electrode layer including a positive electrode current collector and a positive electrode mixture layer; a negative electrode layer including a negative electrode current collector and a negative electrode mixture layer; and a solid electrolyte layer. The solid electrolyte layer is disposed between the positive electrode mixture layer and the negative electrode mixture layer. On a plane perpendicular to a stacking axis, an area of the negative electrode mixture layer is larger than an area of the positive electrode mixture layer. On the stacking axis, an entire portion of the positive electrode mixture layer overlaps a portion of the negative electrode mixture layer.