A method of fastening a sealing bellows to a ball joint as well as to a ball joint is shown comprising a joint housing, a ball stud pivotally received in the joint housing, and a sealing bellows which, related to a joint axis, comprises a first axial end of the bellows resting against the ball stud and a second axial end of the bellows fastened to the joint housing, the joint housing for fastening the sealing bellows comprising a seat of the bellows forming a radial stop as well as an axial stop for the second axial end of the bellows, and wherein a closed retaining ring is provided which is spaced from the joint housing and acts upon the sealing bellows in radial inward direction against the seat of the bellows.