Abstract: A pressure sensor (1) is provided which has a piezoresistive membrane (2) which can be deformed by the action of the pressure of a medium. The membrane (2) is arranged on a carrier substrate (3) and extends over an opening (32) in the carrier substrate (3). The pressure sensor (1) has a protective layer (4) to protect the membrane (2) from direct contact with a medium. The protective layer (4) covers the membrane (2) both in a first region (28) inside the opening (32) and in a second region (29) outside the opening (32). Furthermore, a process for producing a pressure sensor (1) is provided in which the protective layer (4) forms an etch stop for an etching process.