PURPOSE: To easily color separate an incident light due to difference of generated charge amounts by selectively forming a plurality of photodetectors having different forming depths at a predetermined interval, and omitting color filters corresponding to the photodetectors.

CONSTITUTION: Since forming depths of photodetectors are differentiated to a plurality of types, even if the same monochromatic colors are incident, charge amounts generated based on an incident light become different according to the various types of the photodetectors, and color separations of the light can be easily performed according to the difference of the generated charge amounts. For example, the forming depths of a third photodetector 14 (corresponding to red light) are selectively formed to a range A-B, those of a second photodetector 13 (corresponding to green light) are formed to a range B-C, and those to a third photodetector 12 (corresponding to blue light) are formed to a range C-D for the main surface of a semiconductor substrate 11.