An optical module that achieves an adjustable aperture with a multilayer liquid crystal diaphragm, and an electronic apparatus using the optical module are described. The optical module includes at least one diaphragm layer having a light-transmission area that is fully transmissive and a variable light-transmission area filled with material having variable transmittance; and an electrode unit for applying an adjustment voltage to the at least one diaphragm layer. Transmittance of the variable light-transmission area varies in accordance with the adjustment voltage applied by the electrode unit.