An image sensor includes: a charge generating unit that generates a charge in response to light, and has a potential well that stores the charge; a first charge storage unit the first charge storage unit having a potential well deeper than the potential well of the charge generating unit and storing a charge transferred from the charge generating unit; a first electrode covering an end of the charge generating unit, to which a voltage is applied, to form a gradient of a potential so that a charge stored in the charge generating unit is transferred to the first charge storage unit; and a second electrode covering a part of the charge generating unit, to which a voltage is applied to make a part of the potential well of the charge generating unit shallow, the shallow part corresponding to the part of the charge generating unit covered by the second electrode.