Solid-state image sensor

A solid-state image sensor comprising:

• a photosensitive cell array in which a plurality of unit blocks, each including first, second, third and fourth photosensitive cells that are arranged in two rows and two columns, are arranged two-dimensionally on an imaging area, wherein in each said unit block, the first, second, third and fourth photosensitive cells are arranged at row 1, column 1 position, row 2, column 1 position, row 1, column 2 position, and row 2, column 2 position, respectively;
• a dispersive element array including a first dispersive element and a second dispersive element which has a different light-dispersing property from the first dispersive element, the first dispersive element being arranged to face at least partially at least one of the first and third photosensitive cells and to split incoming light according to its wavelength in a direction in which the first and third photosensitive cells are arranged, the second dispersive element being arranged to face at least partially at least one of the second and fourth photosensitive cells and to split incoming light according to its wavelength in a direction in which the second and fourth photosensitive cells are arranged;
• and
• a plurality of condensing elements, each of which is arranged in an area that covers the first and third photosensitive cells and which is configured to condense light onto the first and third photosensitive cells.