An imaging apparatus includes: an imaging device; a lens optical system including a focus lens for condensing light toward the imaging device; a driving section configured to driving one of the imaging device and the focus lens to change a position to which a focus is adjusted on an object side; a shutter provided at at least one of the imaging device and a position between the lens optical system and the imaging device; and a control unit configured to control the shutter and the driving section, wherein the control unit drives the imaging device or the focus lens such that a focus is adjusted to each of first to third focusing positions of different object distances and controls the shutter and the driving section such that image signals of first to third object images at the first to third focusing positions are obtained by the imaging device.