Patent ID: 8546151

Claim:
A method for manufacturing a magnetic storage device having a TMR element, the method comprising the steps of: forming an insulating film on an interlayer insulating film provided with a wiring layer; forming an opening in the insulating film so that the wiring layer is exposed therefrom; forming a metal layer on the insulating film so that the opening is filled therewith; polishing and removing the metal layer on the insulating film by a CMP method so that the surface of the insulating film is exposed and forming the metal layer remaining in the opening into a lower electrode; and forming a TMR element on the lower electrode, wherein the forming an opening step comprises a step of: after forming the first opening that reaches the surface of the wiring layer from the surface of the insulating film, forming a second opening that communicates with the first opening and has an opening area larger than that of the first opening, from the surface of the insulating film to the middle of the insulating film.