Ball joint, suspension arm comprising same, and manufacturing method thereof

A suspension arm comprising:

• a ball stud including a spherical ball;
• a bearing in which the spherical ball is accommodated;
• a housing having an inner peripheral portion and an outer peripheral portion, the bearing being accommodated in the inner peripheral portion;
• an arm body coupled to the outer peripheral portion of the housing;
• and
• an insert molding part which is injected to a lower portion of the bearing and the outer peripheral portion of the housing to be coupled to the bearing, the housing, and the arm body,
• wherein the housing comprises a matching portion formed to protrude in a radially outward direction from an upper portion of the outer peripheral portion,
• an upper portion of the matching portion includes a matching surface formed to be perpendicular to an axial direction and configured to be brought into contact with a mold, and
• a top surface of the insert molding part is in line with the matching surface.