An imaging device for an imaging apparatus adapted to image an object through an image formation lens includes: a light receiving section having a plurality of light receiving elements; a microlens section having a plurality of microlenses respectively provided corresponding to a plurality of the light receiving elements to make the corresponding light receiving elements receive an object light beam that passed through the image formation lens; a control section adapted to control shapes of the plurality of the microlenses so as to control pupil regions in an exit pupil of the image formation lens that pass a light beam that should be received by each of the plurality of the light receiving elements; and an image signal generation section adapted to generate an image signal of an image of the object based on imaging signals of the plurality of the light receiving elements.