Imaging device

An imaging device, comprising:

• a solid-state imaging element that generates a pixel signal by photoelectric conversion according to an amount of incident light;
• an integrated configuration unit that integrates a function of fixing the solid-state imaging element and a function of cutting off infrared light of the incident light;
• and
• a lens group that includes a plurality of lenses and focuses the incident light on a light receiving surface of the solid-state imaging element,
• wherein the integrated configuration unit deploys a lowermost layer lens of the lens group in a foremost stage in a direction for receiving the incident light and the lowermost layer lens constitutes a lowermost layer with respect to an incident direction of the incident light,
• wherein the lowermost layer lens is an aspherical and recessed lens, an effective region for converging the incident light on the solid-state imaging element is defined, a size of the effective region in a vertical direction with respect to the incident light is smaller than a size of an external shape of the lowermost layer lens, and the size of the external shape of the lowermost layer lens in the vertical direction with respect to the incident light is smaller than a size of the solid-state imaging element, and
• wherein the solid-state imaging element includes a silicon through electrode disposed outside the effective region in the vertical direction with respect to the incident light.