To attain the high speed closing action of a shutter blade used also as a diaphragm while attaining the miniaturization of a driving source and low power consumption.

As for the device which is constituted so that a light shielding blade 30 may be driven by the driving source 40 provided with a rotor 41, a driving coil 42 and a detecting coil 43 for detecting the operating state of the rotor 41 by a generated voltage, in the case of controlling the light shielding blade 30 so as to perform a light shielding action (closing action), not only the driving coil 42 but also, the detection coil 43 is energized, then, the rotating force of the rotor 41 is enhanced, and then, the light shielding blade 30 is actuated at a high speed.