Patent ID: 8216873

Claim:
A method for fabricating a back-illuminated type imaging device in which light is illuminated from a back-surface side of a semiconductor substrate, and charges that are generated in response to the light are read out from a front-surface side of the semiconductor substrate to perform imaging, the method comprising: forming a plurality of first through holes in a plane area, on which pad portions to be formed on the back surface of the semiconductor substrate is to be formed, from the front-surface side of the semiconductor substrate so that the through holes extends from the front surface of the semiconductor substrate and reaches the back surface; filling the plurality of first through holes with a conductive material to form a plurality of first pillars made of the conductive material; forming wiring portions on the front surface of the semiconductor substrate so that the wiring portions are connected to the plurality of first pillars; and after the wiring portions are formed, forming the pad portions on the back surface of the semiconductor substrate so that the pad portions are connected to the plurality of first pillars.