To provide an imaging device and an imaging system capable of controlling a stop having high speed, high accuracy, space saving, energy saving, and high durability as compared with a conventional mechanical type stop mechanism.

In the imaging device constituted of a plurality of pixels and capable of picking up an image formed by an optical system in the imaging system and outputting an image pickup signal, each pixel is provided with a photoelectric conversion part and an optical element and the photoelectric conversion part is divided into a plurality of areas by concentrical boundaries.