Patent ID: 8503118

Claim:
A lens driving device mounted in an optical unit, the lens driving device comprising: a lead screw to be rotated by a motor; a movable member including a gear portion that is a rack gear portion or a half nut portion that meshes with the lead screw; a lens holder configured to reciprocate along a rotation axis of the lead screw as the lead screw rotates, the lens holder including a spring supporting frame; a guide shaft that extends parallel to the rotation axis, the guide shaft extending through the movable member and the spring supporting frame; and a coil spring that is wound around the guide shaft and disposed in the spring supporting frame, the coil spring having a first end abutting against the lens holder and a second end abutting against the movable member, the coil spring pressing the gear portion against the lead screw with an urging force thereof applied to the gear portion through the second end, wherein the guide shaft guides both of the lens holder and the movable member to reciprocate along the rotation axis, and guides the movable member to rotate therearound.