Electrostatic input device

An electrostatic input device comprising:

• at least one first sensor electrode disposed on a multi-layer substrate, configured to detect an input operation;
• a plurality of electronic parts disposed on the multi-layer substrate;
• at least one second sensor electrode disposed on the multi-layer substrate, configured to detect a noise from the plurality of electronic parts, the second sensor electrode being disposed between the first sensor electrode and the plurality of electronic parts;
• a first shield electrode disposed on the multi-layer substrate;
• and
• a measurement circuit configured to measure a capacitance of the first sensor electrode and a capacitance of the second sensor electrode, the measurement circuit calculating a difference between the capacitance of the first sensor electrode and a proportioned capacitance which is a value obtained by multiplying the capacitance of the second sensor electrode by a constant,
• wherein, in plan view from a direction normal to the multi-layer substrate, the second sensor electrode surrounds the first sensor electrode, the plurality of electronic parts are disposed around the second sensor electrode, and the first shield electrode encloses each of the first sensor electrode, the second sensor electrode, and the plurality of electronic parts,
• and wherein the first sensor electrode, the second sensor electrode, and the first shield electrode are driven by signals each including an alternating-current component having a same frequency and a same phase.