Pressure switch and hermetically sealed electric compressor

A pressure switch comprising:

• an airtight metallic pressure vessel,
• a contact mechanism, which is provided inside the pressure vessel, and which assumes an open state from a closed state when a pressing force acts thereon,
• at least one airtight terminal provided through an end surface section of the pressure vessel and connected to the contact mechanism,
• a metallic first diaphragm, which is air-tightly secured to a surface section at one end of the pressure vessel, and which is deformed to move by a first moving pressure that is higher than an atmospheric pressure and is to be reset to its original shape by a reset pressure that is lower than the first moving pressure,
• a first plunger provided through the surface section at the one end of the pressure vessel, and caused by the movement of the first diaphragm to press the contact mechanism and then switch to the open state,
• a metallic second diaphragm, which is air-tightly secured to a surface section at the other end of the pressure vessel, and which is deformed to move by a second moving pressure that is higher than the reset pressure and the first moving pressure and is not to be reset under an atmospheric pressure, and
• a second plunger provided through the surface section at the other end of the pressure vessel, and caused by the movement of the second diaphragm to press the contact mechanism and then switch to the open state.