The imaging device manufacturing method and a micro lens array

A plurality of pixels having a photoelectric conversion function imaging device (3) comprising a (3a), the micro lenses in which a plurality of micro lenses for forming a subject image on the plurality of pixels (3a) (1a) are arranged in horizontal and vertical directions array (1) and are arranged opposite. Microlens array (1) it is provided with a lattice-shaped groove (20) between adjacent micro lenses (1a). The depth of the groove (20) is deeper than half the thickness of the microlens array (1). Accordingly, easier to manufacture, apparatus configuration can be simplified, effects and cross talk of stray light is sufficiently reduced can be realized an image pickup apparatus capable of clear imaging.