Provided is a manufacturing method enabling simultaneous and uniform manufacturing of oxide semiconductor secondary batteries on multiple chips. This manufacturing method is for chips having, laminated on circuits thereof, oxide semiconductor secondary batteries each formed through lamination of a first electrode 52, charging function layers (54, 56, 58), and a second electrode 60, and comprises:a lamination process in which the respective oxide semiconductor secondary batteries are integrally laminated and formed on regions corresponding to multiple chips 22 formed on a wafer 20 without individually forming each of the oxide semiconductor secondary batteries on a region corresponding to one of the chips 22; and a dividing process in which pattern etching is performed on the integrally formed oxide semiconductor secondary batteries so as to keep the regions corresponding to the respective chips 22 but remove the regions not corresponding to the chips 22 to divide the individual oxidesemiconductor secondary batteries (50-1, 50-2) corresponding to the respective chips 22.