Optical device

An optical device comprising:

• an optical film, wherein the optical film comprises:
• a first base film and a second base film;
• a light modulation layer existing between the first and second base films;
• electrode layers formed on surfaces of the first and second base films that face the light modulation layer, wherein each electrode layer comprises a first region capable of applying an electric field to the light modulation layer, and a second region connecting the electrode layer to an external power source so that the first region can apply the electric field, wherein the second region on the first base film and the second region on the second base film face each other, wherein, in each electrode layer, the second region surrounds the first region, and the second region comprises a region A which is electrically connected to the first region and a region B which is not electrically connected to the first region;
• and
• an insulating layer disposed between the facing second regions of the first and second base films.