A ball joint and a manufacturing method of the same. The ball joint comprises a holder and a ball and rod which is rotatably and movably secured to the holder and a sealing member which is secured between the spherical body of the ball and rod and a sphere receiving portion of the holder. An oil basin to which a cover member is secured from outside of the holder is formed at the bottom portion of the sphere receiving portion of the aforesaid holder, whereby smooth rotation and movement can be obtained.