Patent ID: 8581313

Claim:
A solid-state imaging device comprising: a semiconductor substrate in which a light receiving part having a photoelectric converting function is formed in an inner portion; a wiring layer having a lamination structure including a first insulating film and a wiring, formed above the semiconductor substrate, and provided with a concave portion in a place corresponding to a portion disposed above the light receiving part; a second insulating film having a higher refractive index than the first insulating film and formed in such a state as to cover at least a side surface of the wiring layer facing the concave portion; a third insulating film having a lower refractive index than the second insulating film and formed in such a state as to cover at least a side surface of the second insulating film corresponding to the side surface of the wiring layer facing the concave portion; a fourth insulating film having a higher refractive index than the third insulating film and formed in such a state as to cover at least a side surface of the third insulating film corresponding to the side surface of the second insulating film; and an optical waveguide having a double light confinement structure constituted by portions of the second, third and fourth insulting films formed in the concave portion.