ZOOM LENS BARREL

PROBLEM TO BE SOLVED: To provide a zoom lens barrel that is capable of high magnification zooming and a further reduction in length in the direction of the optical axis of a photographic lens in a collapsed state of the zoom lens barrel. SOLUTION: The zoom lens barrel 1 includes: a fixed frame 2; a rotation frame 3; a moving frame 4 moved in the direction of an optical axis together with the rotation frame; and a float key 5 moved while regulated in rotation around the optical axis; an inner cam frame 9 having a cam follower 9b, rotated by the rotation frame 3, and moved in the direction of the optical axis; a guide frame 6 having a cam follower 25a and moved in the direction of the optical axis; an outer cam frame 7 movable in the direction of the optical axis, moved in the direction of the optical axis together with the guide frame 6, and rotatable relative to the guide frame 6; a two group zoom frame 11 holding a two group lens 62, having cam followers 11a and 11b, regulated in rotation around the optical axis, and moved in the direction of the optical axis; and a one group zoom frame 8 holding the one group lens 61, having the cam follower 24, and moved in the direction of the optical axis. COPYRIGHT: (C)2011,JPO&INPIT