Vacuum therapy unit for the treatment of wounds on the human or animal body by means of vacuum, comprising - a housing delimiting the vacuum therapy unit to the outside, - a pump for generating a vacuum, with an inlet and an outlet, - a sound damper for the pump, with a housing forming a cavity, and with a sound-damping material, an inlet and an outlet, wherein the outlet of the pump is in fluidic communication with the inlet of the sound damper, and the outlet of the sound damper is in fluidic communication with the atmosphere surrounding the vacuum therapy unit, and wherein the pump and the sound damper are located inside the housing of the vacuum therapy unit, characterized in that the housing of the sound damper comprises a hollow body in the form of a right prism with a base surface, a top surface and a lateral surface (30, 31, 32), wherein - the base surface of the prism is formed on the basis of a right-angled triangle with a first cathetus, a second cathetus and an imaginary hypotenuse, wherein the base surface has a stairway-like gradation along the imaginary hypotenuse, and wherein the portions of the base surface that form the stairway-like gradation extend either parallel or at a right angle to the first or the second cathetus (27, 28), such that the lateral surface of the prism has a non-stepped first side face and a non-stepped second side face and a stepped third side face, wherein - one or more partition walls, which extend parallel to the first side face of the prism and along an edge of the third side face of the prism, are arranged in the cavity of the prism, such that the sound damper has substantially cuboid, mutually adjoining filter chambers of different size. - a housing delimiting the vacuum therapy unit to the outside, - a pump for generating a vacuum, with an inlet and an outlet, - a sound damper for the pump, with a housing forming a cavity, and with a sound-damping material, an inlet and an outlet, wherein the outlet of the pump is in fluidic communication with the inlet of the sound damper, and the outlet of the sound damper is in fluidic communication with the atmosphere surrounding the vacuum therapy unit, and wherein the pump and the sound damper are located inside the housing of the vacuum therapy unit, characterized in that the housing of the sound damper comprises a hollow body in the form of a right prism with a base surface, a top surface and a lateral surface (30, 31, 32), wherein - the base surface of the prism is formed on the basis of a right-angled triangle with a first cathetus, a second cathetus and an imaginary hypotenuse, wherein the base surface has a stairway-like gradation along the imaginary hypotenuse, and wherein the portions of the base surface that form the stairway-like gradation extend either parallel or at a right angle to the first or the second cathetus (27, 28), such that the lateral surface of the prism has a non-stepped first side face and a non-stepped second side face and a stepped third side face, wherein - one or more partition walls, which extend parallel to the first side face of the prism and along an edge of the third side face of the prism, are arranged in the cavity of the prism, such that the sound damper has substantially cuboid, mutually adjoining filter chambers of different size.