Assembly method and assembly device for suspension device of vehicle and mixed model production line

An assembly method for a suspension device of a vehicle, the suspension device comprising a suspension member which is elastically and swingably supported by a vehicle body and supports a wheel;

• and a coil spring which is interposed between the vehicle body and the suspension member and receives a compression load, the assembly method being characterized by:
• bringing a fastening member into a distorted state, and connecting the suspension member, which is elastically and swingably supported by the vehicle body, and the vehicle body or a vehicle part attached to the vehicle body, by the fastening member, the fastening member being stretchable to a stretched state wherein it extends to a certain length when tension is applied;
• forcibly changing orientation of the suspension member with respect to the vehicle body so as to increase a distance between the vehicle body and the suspension member at an interposition portion of the coil spring;
• restricting an excessive change in the orientation of the suspension member relative to the vehicle body by the fastening member which stretches to the stretched state wherein it extends to the certain length with the increase in the distance caused by the change in the orientation of the suspension member, and inserting the coil spring between the vehicle body and the suspension member.