The amount of light incident on a photoelectric conversion element is increased while stray light from a backlight below a light-transmitting substrate is prevented from being incident on the photoelectric conversion element. A light-blocking film is formed with a color filter covering a photoelectric conversion element over a light-transmitting substrate and a color filter covering a photoelectric conversion element in an adjacent pixel which overlap each other at the side with respect to the direction in which light travels. In addition, by providing a microlens over the color filter, light which is conventionally not detected is collected to a photoelectric conversion element, and accordingly the amount of light incident on the photoelectric conversion element is increased.