Capacitance detection device and input device

A capacitance detection device that detects a capacitance between a target and a detection electrode, the device comprising:

• a first capacitor disposed in a path between a first node connected to the detection electrode and a second node;
• a second capacitor disposed in a path between the first node and ground;
• a third capacitor disposed in a path between the first node and a third node connected to a shield electrode placed in proximity to the detection electrode;
• an alternating-current voltage output circuit that outputs a first alternating-current voltage to the third node;
• a first attenuation circuit that outputs a second alternating-current voltage resulting from attenuating an amplitude of the first alternating-current voltage;
• and
• a charge amplifier that supplies charge to the first capacitor through the second node and outputs a detection signal matching the supplied charge;
• wherein
• the charge amplifier supplies the charge to the first capacitor so that a voltage generated at the second node approaches the second alternating-current voltage.