Patent ID: 8656787

Claim:
An electrostatic capacitive pressure sensor comprising a pressure sensor chip for detecting an electrostatic capacitance in accordance with the pressure of a medium being measured, wherein: one face of a sensor diaphragm of the pressure sensor is a pressure introduction chamber side for introducing the medium to be measured, and the other face is a capacitor chamber side for forming a capacitor portion; and the sensor diaphragm is of less rigidity toward the center portion from the peripheral edge portion that is a boundary with a diaphragm securing portion of the capacitor chamber side and the peripheral edge portion or the center portion of the sensor diaphragm flexes to the pressure introduction chamber side, and the other flexes to the capacitor chamber side, in accordance with a deposition of a component of a medium to be measured onto a surface of the sensor diaphragm that contacts the medium to be measured.