BALL JOINT

A housing and a ball joint including the housing are provided. The housing includes a holding part which holds an end portion of a dust cover and which can be formed at a low cost by deforming only a deformed part reliably without requiring additional process. A receiving part (38) is provided on an upper end side of a housing body (37). A deformed part (39) is provided at an upper end portion of the housing body (37) to be adjacent to the receiving part (38). A sum of an angle (±) of the outer peripheral surface of the receiving part (38) relative to an axis-perpendicular direction (R) of the housing body (37) and an angle (²) of the outer peripheral surface of the deformed part (39) relative to the axis-perpendicular direction (R) is set to be less than 180°. An inflected part (40) is formed at the outer peripheral surface of the housing body (37) between the deformed part (39) and the receiving part (38). A load to be applied for plastic deformation on the deformed part (39) in an axis direction of the housing body (37) is caused to act intensively on the inflected part (40), so that the load hardly exerts an impact on a portion on the receiving part (38) side. Only the deformed part (39) is deformed reliably and a fitting groove holding the end portion of the dust cover can be formed at a low cost without requiring additional process.