A pressure-measuring device has an initial pressure-measuring cell (1′) with a first thermal expansion coefficient (α1), a first housing (1), which is surrounded circumferentially by a second housing (1) having a second thermal expansion coefficient (α2) which is greater than the first thermal expansion coefficient (α1), and an O-ring, which is positioned between the pressure-measuring cell (1′) and the second housing (2), such that a third housing (3) is provided which circumferentially encloses both the pressure-measuring cell (1′) and the second housing, (2) and which has a third thermal expansion coefficient (α3) that is less than or equal to the first thermal expansion coefficient (α1).