Capacitive detection device

A capacitive detection device comprising:

• a sensor electrode;
• a shield electrode arranged in proximity to the sensor electrode;
• a first voltage output unit configured to output a first alternating current voltage to the sensor electrode;
• a second voltage output unit configured to apply, to the shield electrode, a second alternating current voltage having a same frequency and phase as the first alternating current voltage and amplitude larger than amplitude of the first alternating current voltage;
• a detection unit configured to detect a self-capacitance of the sensor electrode;
• an adjustment electrode arranged in proximity to the sensor electrode;
• and
• a voltage setting unit configured to output, to the adjustment electrode, a third alternating current voltage having a same frequency as the first alternating current voltage, a same phase as the first alternating current voltage, and amplitude smaller than the amplitude of the first alternating current voltage or a third alternating current voltage having a same frequency as the first alternating current voltage and a phase opposite to a phase of the first alternating current voltage or configured to set the adjustment electrode to a fixed potential.