SOLID-STATE BATTERY

A solid state battery that includes at least one battery constituent unit including a positive electrode layer, a negative electrode layer, and a solid electrolyte layer interposed therebetween; a positive electrode external terminal on a first side surface of the solid state battery laminate; and a negative electrode external terminal on a second side surface of the solid state battery laminate. The positive electrode layer and the negative electrode layer each include a terminal contact portion in direct contact with the positive electrode external terminal and the negative electrode external terminal, respectively, and a non-terminal contact portion that is not in direct contact with the positive electrode external terminal and the negative electrode external terminal, respectively, and in at least one of the positive electrode layer and the negative electrode layer, a sectional area of the terminal contact portion is smaller than a sectional area of the non-terminal contact portion.