A ball joint comprising a housing, a bearing sheet and a ball-side member, the ball-side member having a ball part and a shaft part projecting from the ball part, wherein the housing comprises: a circular cylindrical housing body including an inner chamber housing the bearing sheet that holds the ball part of the ball-side member in a manner that allows rotation of the ball part, the housing body including an opening part communicating with the inner chamber and being provided on at least one end portion of the housing body, the opening part through which the shaft part projecting from the ball part of the ball-side member is inserted; a receiving part formed on one end side of the housing body; and a deformed part provided adjacent to the receiving part on the one end side and forming an edge portion of the opening part of the housing body; wherein the housing of the ball joint comprises an inflected part located between the receiving part and the deformed part, wherein the outer peripheral surface of the receiving part extends from the inflected part in a direction having an acute angle (α) which is less than 90° relative to an axis-perpendicular direction of the housing body, wherein an outer peripheral surface of the deformed part extends from the inflected part in a direction having an angle (β) relative to the axis-perpendicular direction of the housing body, and wherein the sum of the angle (α) and the angle (β) is less than 180°, characterised in that the deformed part is plastically deformed in response to application of a load acting in a direction along an axis direction of the housing body and forms a pressing part projecting toward an inner side of the housing body which holds the bearing sheet and an opposite receiving part projecting toward an outer side opposite the inner side of the housing body, forming a holding part between the opposite receiving part and the receiving part, the holding part holding in use an end portion of a dust cover covering the opening part; and the housing further comprises a projecting part formed in an end portion of the outer peripheral surface of the receiving part, which projects in the outer radial direction from an outer peripheral surface of the housing body. a circular cylindrical housing body including an inner chamber housing the bearing sheet that holds the ball part of the ball-side member in a manner that allows rotation of the ball part, the housing body including an opening part communicating with the inner chamber and being provided on at least one end portion of the housing body, the opening part through which the shaft part projecting from the ball part of the ball-side member is inserted; a receiving part formed on one end side of the housing body; and a deformed part provided adjacent to the receiving part on the one end side and forming an edge portion of the opening part of the housing body; wherein the housing of the ball joint comprises an inflected part located between the receiving part and the deformed part, wherein the outer peripheral surface of the receiving part extends from the inflected part in a direction having an acute angle (α) which is less than 90° relative to an axis-perpendicular direction of the housing body, wherein an outer peripheral surface of the deformed part extends from the inflected part in a direction having an angle (β) relative to the axis-perpendicular direction of the housing body, and wherein the sum of the angle (α) and the angle (β) is less than 180°, characterised in that the deformed part is plastically deformed in response to application of a load acting in a direction along an axis direction of the housing body and forms a pressing part projecting toward an inner side of the housing body which holds the bearing sheet and an opposite receiving part projecting toward an outer side opposite the inner side of the housing body, forming a holding part between the opposite receiving part and the receiving part, the holding part holding in use an end portion of a dust cover covering the opening part; and the housing further comprises a projecting part formed in an end portion of the outer peripheral surface of the receiving part, which projects in the outer radial direction from an outer peripheral surface of the housing body.