Capacitance detecting device and capacitance detecting method

The invention relates to a capacitance detecting device and a capacitance detecting method, which can stably detect the electrostatic capacitance change even in a condition of loud noise. The capacitance detecting device comprises switches (SW1, SW2) for switching a voltage level for charging detected capacitors (Cf, Cs) into plural voltage levels in a specified period; plural distributing capacitors (Cdp, Cdn) of charge distributed and fed into the detected capacitors (Cf, Cs); second switches (SW5, SW6) for setting a voltage level for initializing distributing capacitors (Cdp, Cdn) into plural voltage levels in a specified period; other switches (SW3, SW4) for switching connections in a way to make capacitance and charge distributed complementarily from the detected capacitors (Cf, Cs) charge with opposite polarities; and a charge amplifier (12) for converting charge fed into the distributing capacitors (Cdp, Cdn) into voltages.