An image sensor comprising: a sensor substrate comprising a plurality of first photosensitive cells configured to sense light and a plurality of second photosensitive cells configured to sense light; and a color separating lens array disposed above the sensor substrate, the color separating lens array comprising a plurality of first regions and a plurality of second regions, wherein the plurality of first regions respectively correspond to the plurality of first photosensitive cells and have a first fine structure, and the plurality of second regions respectively correspond to the plurality of second photosensitive cells, wherein locations of the plurality of first regions and the plurality of second regions at a center of the color separating lens array coincide with locations of the plurality of first photosensitive cells and the plurality of second photosensitive cells corresponding to the plurality of first regions and the plurality of second regions, and locations of the plurality of first regions and the plurality of second regions on a peripheral portion of the color separating lens array are shifted toward the center of the color separating lens array with respect to the plurality of first photosensitive cells and the plurality of second photosensitive cells corresponding to the plurality of first regions and the plurality of second regions, and characterized in that the plurality of second regions have a second fine structure that is different from the first fine structure, and the first fine structure and the second fine structure are configured to form a phase distribution below the plurality of first regions and the plurality of second regions, wherein light of a first wavelength and light of a second wavelength among incident light incident on the color separating lens array are branched into different directions and focused on the plurality of first photosensitive cells and the plurality of second photosensitive cells, respectively based on the phase distribution. a sensor substrate comprising a plurality of first photosensitive cells configured to sense light and a plurality of second photosensitive cells configured to sense light; and a color separating lens array disposed above the sensor substrate, the color separating lens array comprising a plurality of first regions and a plurality of second regions, wherein the plurality of first regions respectively correspond to the plurality of first photosensitive cells and have a first fine structure, and the plurality of second regions respectively correspond to the plurality of second photosensitive cells, wherein locations of the plurality of first regions and the plurality of second regions at a center of the color separating lens array coincide with locations of the plurality of first photosensitive cells and the plurality of second photosensitive cells corresponding to the plurality of first regions and the plurality of second regions, and locations of the plurality of first regions and the plurality of second regions on a peripheral portion of the color separating lens array are shifted toward the center of the color separating lens array with respect to the plurality of first photosensitive cells and the plurality of second photosensitive cells corresponding to the plurality of first regions and the plurality of second regions, and characterized in that the plurality of second regions have a second fine structure that is different from the first fine structure, and the first fine structure and the second fine structure are configured to form a phase distribution below the plurality of first regions and the plurality of second regions, wherein light of a first wavelength and light of a second wavelength among incident light incident on the color separating lens array are branched into different directions and focused on the plurality of first photosensitive cells and the plurality of second photosensitive cells, respectively based on the phase distribution.