Abstract: In fastening a sealing bellows to the housing of a ball joint, the sealing bellows has a doughnut-form rim which seats in a circumferential ring groove, open in the axial direction and designed U-shaped in cross section, on the outer rim of the housing. The ring groove is formed in part by a circumferential recess, L-shaped in cross section, on the housing rim, and by an L-shaped holding ring, opposite in cross section to the recess and fastened into this latter. To simplify this fastening and to protect the fixing of the sealing bellows, the flat bottom of the opening has a circumferential ring step lying radially inward, and the fastening of the holding ring by its ring flange to the ring step against the radially extending surface of the recess, is made by means of a circumferential projection or several segment-like projections staked from the ring step.