A manufacturing method of a semiconductor device of this invention
includes forming metal pads on a Si substrate through a first oxide film,
bonding the Si substrate and a holding substrate which bolsters the Si
substrate through a bonding film, forming an opening by etching the Si
substrate followed by forming a second oxide film on a back surface of
the Si substrate and in the opening, forming a wiring connected to the
metal pads after etching the second oxide film, forming a conductive
terminal on the wiring, dicing from the back surface of the Si substrate
to the bonding film and separating the Si substrate and the holding
substrate.