Patent ID: 8625205

Claim:
A lens barrel comprising: a first lens unit configured to hold a first lens group; a second lens unit configured to hold a second lens group; a first cam member with which said first lens unit is cam-engaged and which is configured to rotate to move said first lens unit in a direction of an optical axis; a second cam member with which said second lens unit is cam-engaged and which is configured to rotate to move said second lens unit in the direction of the optical axis; a translating cylinder configured to inhibit rotation of said first lens unit; a first translating guide unit provided between said first lens unit and said second lens unit, and configured to linearly guide said second lens unit in the direction of the optical axis while inhibiting rotation of said second lens unit; and a second translating guide unit provided between said second lens unit and said translating cylinder, and linearly guide said second lens unit in the direction of the optical axis while inhibiting rotation of said second lens unit, wherein linear guide by said first translating guide unit is switched to linear guide by said second translating guide unit when said second lens unit moves in a direction relatively away from said first lens unit.