To provide a vehicle suspension device that can inform deterioration of a ball joint to a user at an early stage.

A socket 6f of a ball joint 6 has an inner side surface 6g and a bottom surface 6i that retain a seat 6d. An edge 6j of an aperture 6e is formed like an overhang to look like a shape of a beak by inclining a part 6k corresponding to an edge 6j of the inner side surface 6g toward the bottom part 6i, in other words by denting the recess to the radially outer part of an aperture 6e.