A lubricant composition and a ball joint are disclosed. The lubricant composition has about 100 parts by weight of a viscous material chosen from polyisoprene rubber or a viscous composition of a polyisoprene rubber viscous substance, about 15-45 parts by weight of at least one compound chosen from a specific group of aliphatic amides or a specific group of aliphatic bisamides and about 5-30 parts by weight of at least one wax chosen from polyethylene wax, paraffin wax and microcrystalline wax. A ball joint is disclosed that contains this lubricant composition.