Imaging device and imaging apparatus

An imaging apparatus, comprising:

• an imaging device which includes:
• a light receiving unit provided on a first surface side of a semiconductor substrate and having a plurality of pixels arranged in a two-dimensional form;
• and
• a read-out circuit provided on a second surface side of the semiconductor substrate opposite to the first surface side and configured to read signals from the pixels, wherein
• each of the pixels has at least two photoelectric conversion elements and a separation region which is a region between the two photoelectric conversion elements, and
• a separation region control electrode arranged on the second surface side of the separation region and configured to control a potential of the separation region,
• wherein the imaging apparatus including:
• at least one processor or circuit configured to function as:
• a voltage control unit configured to control a potential of the separation region by controlling a voltage applied to the separation region control electrode of the imaging device.