A lens barrel with a shutter unit. While the lens barrel is retracted to obtain a collapsed state or advanced to obtain a photographing state, the flexible printed circuit board of the shutter unit is bendable so as to provide a variable length for the rotation of the shutter unit 71 around the rotary axis J2 parallel with the optical axis J1. When the lens barrel is operated in the photographing state, the flexible printed circuit board is foldable so as to provide a variable length for the movement of the shutter unit 71 in the optical axis J1. The flexible printed circuit board can support flexibly without twisting and loosening. The lens barrel further includes a restraint member to bring the shutter unit 71 rotating around the central axis and to restrain the rotation of the shutter unit 71.