PURPOSE: To drive a moving lens barrel and a light quantity controlling member with high output efficiency, by incorporating an energizing coil in a lens barrel, generating the magnetic fields in the direction parallel to optical axis and the direction vertical to optical axis by switching the conduction direction to the energizing coil, and incorporating them in a tightly sealed state.

CONSTITUTION: Ringlike magnets 2a, 2b are inserted into a recessed part 1c of lens barrels 1a, 1b for holding lenses L1WL4, and are held so as to be rotatable by shafts 4a, 4b. Sectors 6a, 6b are fixedly provided on the magnets 2a, 2b, and control opening and closing of the optical path in accordance with turning of the magnet. Energizing coils 10A, 10B are placed on the outside circumferential face of the moving lens barrel, the moving lens barrel is turned and energized counterclockwise by a spring member 18, and the pawl part is engaged with a magnetic member 12 and stops. When electric conduction is executed in the prescribed direction to the energizing coils 10A, 10B, the magnets 2a, 2b are turned and the sector is controlled. Also, the magnetic member 12 is magnetized, the attracting member is attracted and the focusing adjustment is executed, by the prescribed conduction.