Optical device having improved impact resistance

An optical device comprising:

• a lens holding member configured to hold a first lens, and having a plurality of follower pins formed thereon in a radially protruding manner;
• a cam member disposed outside said lens holding member and having a cam groove formed therein for engagement with any one of said follower pins;
• a first moving member disposed on an image surface side of said lens holding member in an optical axis direction and configured to move in the optical axis direction;
• and
• a second moving member disposed on an image surface side of said first moving member in the optical axis direction, configured to move in the optical axis direction, and configured to hold a second lens,
• wherein said first moving member has a plurality of first portions formed thereon, each of said plurality of first portions comprising a protrusion extending toward an object side,
• wherein said second moving member has a plurality of second portions formed thereon, each of said plurality of second portions comprising another protrusion extending toward the image surface side,
• wherein in a case where said first moving member and said second moving member move in the optical axis direction, the optical device is switched between a wide angle position in which one of said plurality of first portions and said any one of said follower pins are aligned in a radial direction of the optical device, and a telephoto position in which one of said plurality of second portions and said any one of said follower pins are aligned in the radial direction of the optical device, the second lens and said plurality of first portions being disposed on the object side of said plurality of second portions and said plurality of follower pins aligned when in the telephoto position, and
• wherein another plurality of said first portions and another plurality of said second portions are formed at respective locations different in phase by 180 degrees from the location where said any one of said follower pins is formed, and are not aligned with each of the plurality of follower pins in the radial direction of the optical device.