The solid-state image sensor 10 includes an array of photosensitive cells and an array 100 of dispersing elements. The photosensitive cell array is comprised of unit blocks 40, each including four photosensitive cells 2a, 2b, 2c and 2d. The dispersing element array 100 makes light, obtained by subtracting a light ray with a first color component C1 from the incoming light W and adding a light ray with a second color component C2 to the remainder, incident on the first photosensitive cell 2a, also makes light, obtained by subtracting the light ray with the second color component C1 from the incoming light W and adding the light ray with the first color component C1 to the remainder, incident on the second photosensitive cell 2b, further makes light, obtained by subtracting the light rays with the first and second color components C1+C2 from the incoming light W, incident on the third photosensitive cell 2c, and further makes light, obtained by adding the light rays with the first and second color components C1+C2 to the incoming light W, incident on the fourth photosensitive cell 2d.