A torsional vibration damper has a drive-side transmission element and an output-side transmission element rotatable relative thereto. The output-side transmission element is centered relative to the drive-side transmission element via a radial slide bearing and can be held at a predeterminable axial distance from the drive-side transmission element by means of an axial slide bearing. The axial slide bearing has an inner circumference larger than the outer circumference of the radial slide bearing and rests, on the one hand, on at least one component of the first transmission element acting on the outer circumference of the radial slide bearing and, on the other, on at least one component of the other transmission element arranged on the inner circumference of the radial slide bearing, so as to form, together with these components, a covering for the radial slide bearing, by which the latter can be protected against an unwanted afflux of solid particles.