Electrical capacitance sensor

(20) Is formed by capacitance section electrode with the displacement electrode (40) is in substrate (E1) and reference electrode, a configured with dome of the movable electrode, and connected with the reference electrode, contact switch and fixed electrode plate is formed with a reference electrode and inner for cover is a. To the detection component (30) capable operation, comprising a switch movable electrode surface of the displacement; and switch contact electrode, a switch and a starting a state. A clock, and a application detection component (30) is arranged between the change of the capacitance section () curved capacitance and displacement electrode (40) and capacitance - circuit composed of a force of.