A solid-state image pickup device which includes a substrate carrying a plurality of photoelectric conversion elements which are two-dimensionally arranged therein the substrate having a plurality of rectangular light-receiving faces each corresponding to the photoelectric conversion element, a flattening layer having a plurality of approximately rectangular concave faces each located to correspond to the light-receiving faces, and a color filter having color layers of plural kinds of colors and buried in the concave faces of the flattening layer, the color filter exhibiting a larger refractive index than that of the flattening layer, wherein the color layers are respectively enabled to function as a convex lens.