Patent ID: 7755150

Claim:
A MOS solid-state image pickup device comprising, on an N-type semiconductor substrate, a pixel region, in which a plurality of pixels are formed, and a peripheral circuit region in which a peripheral circuit of the pixel region is formed, wherein the pixel region and the peripheral circuit region each include an N-type epitaxial layer which is formed above the N-type semiconductor substrate, the pixel region includes: a first P-type well formed above the N-type epitaxial layer; and light receiving regions, which are formed within the first P-type well and each of which is a component of a photodiode, and the peripheral circuit region includes: second P-type wells, which are formed to a desired depth from a surface of the peripheral circuit region and each of which is a component of an N-Channel MOS transistor; an N-type well which is formed to a desired depth from the surface of the peripheral circuit region and which is a component of a P-Channel MOS transistor; and a third P-type well which is formed so as to have such a shape as to isolate the N-type well from the N-type epitaxial layer and which has a higher impurity concentration than that of the first P-type well.