There is provided a lens barrel including: a rear barrel to which an imaging device is attachable, an imaging optical system leading a subject image to the imaging device, and an image blur correcting unit moving a shift lens forming the imaging optical system in a plane perpendicular to an optical axis of the imaging optical system. The image blur correcting unit includes a base supporting the shift lens in a plane perpendicular to the optical axis of the imaging optical system. The lens barrel includes a support mechanism supporting the base to be movable relative to the rear barrel along a plane perpendicular to the optical axis; and a fixing device fixing the base to the rear barrel.