Differential pressure sensor, with - a first and a second counter-electrode (1, 3), - a conductive disk, arranged between the two counter-electrodes (1, 3), - a first isolating layer, via which an outer edge of the disk is connected to an outer edge of the first counter-electrode, forming a first pressure chamber, - a second isolating layer, via which an outer edge of the disk is connected to an outer edge of the second counter-electrode, forming a second pressure chamber, - a cavity provided in the first counter-electrode, via which the first pressure chamber can be subjected to a first pressure (p 1), and - a cavity provided in the second counter-electrode, via which the second pressure chamber can be subjected to a second pressure (p 2), characterized in that - the disk is divided by a trench into an interior zone serving as an electrode and an exterior zone which is electrically isolated from the interior zone by the trench, - the interior zone comprises a measuring diaphragm arranged between the two pressure chambers and a marginal zone surrounding the measuring diaphragm, situated between the inner edges of the two isolating layers (7, 11), and - the interior zone forms - with each of the counter-electrodes (1, 3) - a capacitor with a capacitance (C1, C3) that depends on a differential pressure (Δp) between the first and the second pressure (p 1, p 2), said differential pressure acting on the measuring diaphragm, wherein the capacitors are each formed by an inner partial capacitor whose capacitor surfaces correspond to the surface of the measuring diaphragm, and an outer partial capacitor that surrounds the inner partial capacitor on the outside, and wherein the surface of the trench and the surface of the entire exterior zone of the disk do not contribute to the capacitor surface of the outer partial capacitors due to the trench. - a first and a second counter-electrode (1, 3), - a conductive disk, arranged between the two counter-electrodes (1, 3), - a first isolating layer, via which an outer edge of the disk is connected to an outer edge of the first counter-electrode, forming a first pressure chamber, - a second isolating layer, via which an outer edge of the disk is connected to an outer edge of the second counter-electrode, forming a second pressure chamber, - a cavity provided in the first counter-electrode, via which the first pressure chamber can be subjected to a first pressure (p 1), and - a cavity provided in the second counter-electrode, via which the second pressure chamber can be subjected to a second pressure (p 2), characterized in that - the disk is divided by a trench into an interior zone serving as an electrode and an exterior zone which is electrically isolated from the interior zone by the trench, - the interior zone comprises a measuring diaphragm arranged between the two pressure chambers and a marginal zone surrounding the measuring diaphragm, situated between the inner edges of the two isolating layers (7, 11), and - the interior zone forms - with each of the counter-electrodes (1, 3) - a capacitor with a capacitance (C1, C3) that depends on a differential pressure (Δp) between the first and the second pressure (p 1, p 2), said differential pressure acting on the measuring diaphragm, wherein the capacitors are each formed by an inner partial capacitor whose capacitor surfaces correspond to the surface of the measuring diaphragm, and an outer partial capacitor that surrounds the inner partial capacitor on the outside, and wherein the surface of the trench and the surface of the entire exterior zone of the disk do not contribute to the capacitor surface of the outer partial capacitors due to the trench.