<p>It is possible to provide a light modulator using a thin plate having a thickness of 20 µm or below capable of stably holding a conductive film suppressing troubles such as resonance phenomenon of microwaves in a substrate and pyro-electric phenomenon. It is also possible to provide a method for fabricating the light modulator. The light modulator includes: a thin plate (10) formed of a material having a photoelectric effect and having a thickness of 20 µm or below; light waveguide (11) formed on the front or rear surface of the thin plate; and modulation electrodes (13, 14) formed on the front surface of the thin plate for modulating light passing through the light waveguide. The light modulator further includes a reinforcing plate (16) bonded to the rear surface of the thin plate and a conductor film (17) formed on the side surface of the thin plate continuously to the side surface of the reinforcing plate.</p>
