The imaging device includes a lens barrel, which itself includes a first frame, a second frame rotatably supported by the first frame, a lens mount including a contact face that comes into contact with the main body of a camera body, and a linking portion for linking the lens mount and the first frame on the outside of the contact face, with at least part of the second frame being disposed between the linking portion and the contact face along the optical axis direction; and an imaging element for converting an optical image formed by the lens barrel into image data.