Patent ID: 7508605

Claim:
A zoom lens unit comprising: a second lens group and a third lens group arrayed concentrically and in series in this order as from a subject side; a first shaft positioned so as to extend along an optical axis direction of the second lens group and the third lens group; a second shaft positioned so as to extend along the optical axis direction; a first wall member and a second wall member for supporting both ends of each of the first shaft and the second shaft, respectively; a second lens holder on which the second lens group is mounted and which has a shaft hole for insertion of the first shaft therethrough, the second lens holder being movable in the optical axis direction under guidance of the first shaft; a third lens holder on which the third lens group is mounted and which has a shaft hole for insertion of the second shaft therethrough, the third lens holder being movable in the optical axis direction under guidance of the second shaft; and a biasing part for biasing the second lens holder and the third lens holder in directions such that the second and third lens holders are urged away from each other.