A lens barrel 11 is mounted in a collapsible imaging device 1 and includes a third lens frame 55. The third frame 55 is a lens frame to which correction lenses L5, L6, L7 are mounted and includes a shutter unit 57, a vibration compensation actuator 71, a lens frame main body 95, a focus lens frame 105, and a focus motor 115. The focus lens frame 105 is urged against the lens frame main body 95 toward the image plane side by means of a focus spring 110. A motor section 117 of the focus motor 115 is arranged in a region interposed between two multilayer printed circuit boards 77, 79 when viewed from the image plane side or the object side.