Patent ID: 7933511

Claim:
A lens barrel comprising: a barrier drive ring that includes a first rotation-transmitting protrusion which protrudes in a direction of an optical axis toward an imaging area, and a second rotation-transmitting protrusion which is formed at a location parallel to said first rotation-transmitting protrusion and substantially opposed to said first rotation-transmitting protrusion across the optical axis; and an image pickup element-holding member that includes a first cam contact section and a second cam contact section which are brought into contact with said first rotation-transmitting protrusion and said second rotation-transmitting protrusion, respectively, when said lens barrel is retracted, wherein rotation transmission to said barrier drive ring is performed in a varying manner first via a contact between said first rotation-transmitting protrusion and said first cam contact section, then via the contact between said first rotation-transmitting protrusion and said first cam contact section and a contact between said second rotation-transmitting protrusion and said second cam contact section, and finally via the contact between said second rotation-transmitting protrusion and said second cam contact section.