An electronic device comprises a silicon substrate (base material), an underlying insulating film formed on the silicon substrate, a capacitor constructed by forming a bottom electrode, a capacitor dielectric film, and a top electrode sequentially on the underlying insulating film, and a voltage supply circuit for supplying a voltage with a bipolar waveform to at least one of the bottom electrode and the top electrode, wherein an amplitude of the voltage is set to 510⁵ d (V) or less (d: an interval (cm) between the top electrode and the bottom electrode). Accordingly, an electronic device and a method of applying a voltage to a capacitor, capable of prolonging a lifetime of a capacitor by preventing degradation of a capacitor dielectric film are provided.