Patent ID: 8730596

Claim:
An imaging device comprising: an imaging unit having an imaging face which images an image from a luminous flux; a lens barrel having an optical system with an adjustable focal point, and wherein a state of the barrel is changeable between a first state wherein it is possible to focus with respect to the imaging face by focal point adjustment of the optical system, and a second state in which a length of the lens barrel along an optical axis of the optical system is shorter than in the first state wherein it is not possible to focus the image with respect to the imaging face by focal point adjustment; a changing unit for changing the lens barrel from the second state to the first state when the imaging unit is activated; a discriminating unit which discriminates whether the state of the lens barrel is the first state or the second state; and a control unit which, at a time of activating the imaging unit, changes the lens barrel to the first state by the changing unit if it is discriminated that the state of the lens barrel is the second state, and which maintains the first state if it is discriminated that the state of the lens barrel is the first state.