Patent ID: 8582964

Claim:
An imaging device that takes an image of a subject by focusing the image on an imaging plane via an optical system including a zoom lens and a focusing lens, the imaging device comprising: an operation input unit configured to input a zoom operation; a zoom controller configured to move the zoom lens in response to the input zoom operation, so as to change a magnification of the image; a near limit position acquirer configured to obtain a near limit position of the focusing lens to the subject at a zoom lens position, to which the zoom lens is moved by the zoom controller; and a focus controller configured to move the focusing lens in such a range that the focusing lens is not located on a near side of the near limit position, every time the zoom lens is moved by the zoom controller, so as to focus the image on the imaging plane, wherein when a target position of the focusing lens, which is required to keep the image in focus after the zoom lens is moved by the zoom controller, is located on the near side of a threshold position that is specified based on the near limit position, the focus controller moves the zoom lens to a wider position than the zoom lens position, to which the zoom lens is moved by the zoom controller, and subsequently moves the focusing lens to focus the image.