Lens array and image sensor provided with lens array

A thin image sensor which can project illuminating light for illuminating an object and has high optical performance. The image sensor (10) is provided with a lens array (11) wherein lens elements (11a) are arranged in parallel on at least one plane; an image pickup element (13) which receives an optical image formed by an optical system including each lens element (11a) on different image pickup areas including a plurality of photoelectric converting sections and converts the image into electric image signals; and a light source section (14) which can project the illuminating light for illuminating the object whose optical image is to be formed.