A production method for stabilizer links, comprising: a preparing step in which a ball stud having a ball portion, and a ball seat having an opening end surface, a slope portion for a stopper taper in which a diameter is increased toward an opening side in an axial direction, an overhanging portion, and a ball receiving portion from an opening side of a side surface portion in this order, are prepared; a slope portion for a stopper base forming step in which a housing having a caulking portion and a ball seat receiving portion from an opening side of a side surface portion in this order, is molded, and a slope portion for a stopper base having a taper shape in which a diameter is increased toward an opening side in an axial direction, is formed between the caulking portion and the ball seat receiving portion; an outer peripheral end portion taper surface forming step in which a ring member having a stopper base portion is molded, and in molding of the ring member, an outer peripheral end portion taper surface is formed at an opposite side to an opening side in an outer peripheral end portion of the stopper base portion; a first subassembly forming step in which a first subassembly having the ball stud and the ball seat is formed by inserting the ball portion of the ball stud into the ball receiving portion of the ball seat; an abutting step in which a second subassembly is formed by inserting the ball seat of the first subassembly into the ball seat receiving portion of the housing, and by arranging the ring member at an opening side of the ball seat, and in the arranging of the ring member, the stopper base portion is abutted to the opening end surface of the ball seat; and a pressing step in which the caulking portion of the housing of the second subassembly is caulked inwardly by using pressing members (82, 83, 84), and the opening side of the ball seat is pressed through the ring member by the caulking portion, wherein, before the caulking, the caulking portion extends upwardly from an upper end portion of the slope portion for a stopper base in a state in which a cross section is straight, and has the same inner and outer diameters as those of the upper end portion of the slope portion for a stopper base, and has a thickness that is thinner than that of the side surface body, and wherein in the forming of the second subassembly, the outer peripheral end portion taper surface of the stopper base portion of the ring member is abutted to the slope portion for a stopper base of the housing. a preparing step in which a ball stud having a ball portion, and a ball seat having an opening end surface, a slope portion for a stopper taper in which a diameter is increased toward an opening side in an axial direction, an overhanging portion, and a ball receiving portion from an opening side of a side surface portion in this order, are prepared; a slope portion for a stopper base forming step in which a housing having a caulking portion and a ball seat receiving portion from an opening side of a side surface portion in this order, is molded, and a slope portion for a stopper base having a taper shape in which a diameter is increased toward an opening side in an axial direction, is formed between the caulking portion and the ball seat receiving portion; an outer peripheral end portion taper surface forming step in which a ring member having a stopper base portion is molded, and in molding of the ring member, an outer peripheral end portion taper surface is formed at an opposite side to an opening side in an outer peripheral end portion of the stopper base portion; a first subassembly forming step in which a first subassembly having the ball stud and the ball seat is formed by inserting the ball portion of the ball stud into the ball receiving portion of the ball seat; an abutting step in which a second subassembly is formed by inserting the ball seat of the first subassembly into the ball seat receiving portion of the housing, and by arranging the ring member at an opening side of the ball seat, and in the arranging of the ring member, the stopper base portion is abutted to the opening end surface of the ball seat; and a pressing step in which the caulking portion of the housing of the second subassembly is caulked inwardly by using pressing members (82, 83, 84), and the opening side of the ball seat is pressed through the ring member by the caulking portion, wherein, before the caulking, the caulking portion extends upwardly from an upper end portion of the slope portion for a stopper base in a state in which a cross section is straight, and has the same inner and outer diameters as those of the upper end portion of the slope portion for a stopper base, and has a thickness that is thinner than that of the side surface body, and wherein in the forming of the second subassembly, the outer peripheral end portion taper surface of the stopper base portion of the ring member is abutted to the slope portion for a stopper base of the housing.