Suspension for steerable wheel

A double jointed suspension for steerable wheels reduces steering torque. [MEANS FOR SOLVING PROBLEMS] A ball joint unit (21) includes a stud bracket (23) having a substantially rectangular prism shape, a first ball joint (24) provided on the upper face of the stud bracket (23), and a second ball joint (25) provided on the lower face of the stud bracket (23). The first and second stud ball joints(24, 25) are arranged to be upright on the stud bracket (23) at an angular interval of 180 degrees and to be positioned, in a plan view, at a relatively small interval (L) on the stud bracket (23). The stud bracket (23) is constructedfrom a bracket body (31) having substantially rectangular prism shape and from ball studs (32) respectively projecting from the upper and lower surfaces of the bracket body (31).