A capacitance-detection pressure switch and pressure sensor that, in the connection between a diaphragm used as one electrode and a signal line for detecting a signal from the diaphragm, can ensure stable conduction without exerting an influence on operating characteristics of the diaphragm. A capacitance-detection type pressure switch of the present invention includes a metallic diaphragm that is displaced in response to a change in pressure of an operating medium supplied from a conduit, a movable electrode connected electrically to the diaphragm, a fixed electrode provided at an atmospheric pressure side of the diaphragm opposing the conduit, and an insulating film ensuring insulation between the fixed electrode and the diaphragm, wherein an electrode contact portion for connection to the movable electrode is formed as at least one projection extending toward an exterior on a part of the outer periphery of the diaphragm.