The need for miniaturizing camera modules is to be effectively satisfied. There are provided a pixel unit, an image processing unit that processes an image signal generated by the pixel unit, an encoding unit that encodes the image signal processed by the image processing unit, and an address assignment unit that assigns an address to a compressed signal encoded by the encoding unit. The pixel unit is provided on a first substrate. The image processing unit, the encoding unit, and the address assignment unit are provided on a second substrate to be stacked on the first substrate.