An imaging device includes an acquisition unit acquiring a defocus amount for an optical image which is obtained by an imaging element, a recording unit recording a driving speed of lens with the defocus amount in response to an instruction from a user, wherein the lens is controlled, for adjusting a position at which the optical image is focused, by a lens driving unit, an information generating unit generating lens driving information specifying a relation between the defocus amount and the lens driving speed, and a control unit controlling the lens driving unit so as to move the lens to a position at which the optical image is in-focused to the object at a predetermined speed specified in the lens driving information as a driving speed corresponding to the defocus amount acquired by the acquisition unit.