Ball joint and method for manufacturing ball joint

Abstract

Provided are a ball joint and a method for manufacturing the ball joint, which can improve the stiffness of a stud portion. A ball joint 100 includes a stud portion 110 and a housing 120. The stud portion 110 includes a coupling portion 111 to be coupled to a coupling target 10, a flange-shaped receiving portion 115 on which the coupling target 10 is to be located, and a ball portion 114 having a spherical surface. The coupling portion 111 is formed with an external thread portion 112 onto which an attachment nut 12 is to be fastened. The flange-shaped receiving portion 115 is formed so as to project outward in a flange shape in a radial direction from the coupling portion 111. A surface hardening layer 118 having a hardened surface layer is formed on a boundary portion 117 between the coupling portion 111 and the flange-shaped receiving portion 115.

Dependencies are inferred from the claim text.