A method of manufacturing a solid state battery that includes forming a solid state battery precursor by sequentially laminating a positive electrode layer sheet, a solid electrolyte layer sheet, and a negative electrode layer sheet along a laminating direction; providing a terminal non-connection portion contact sheet so as to contact a terminal non-connection portion of an outer edge portion of each of the positive electrode layer sheet and the negative electrode layer sheet, wherein the terminal non-connection portion contact sheet has a ratio of a thermal expansion coefficient of at least one of a solid electrolyte material and an insulating material contained in the terminal non-connection portion contact sheet to a thermal expansion coefficient of an electrode material contained in at least one of the positive electrode layer sheet and the negative electrode layer sheet of 0.7 or more and less than 1.5; and firing the solid state battery precursor.