In a bumper assembly method for assembling a bumper (B) in a vehicle body assembly line while a vehicle body (W) is transported by a transport carriage (2) disposed on a floor conveyor (FC), the vehicle body (W) is placed on a lifting means (3) disposed on the transport carriage (2), and the bumper (B) is fastened to the vehicle body (W) lifted to a predetermined height by the lifting means (3). The bumper is assembled downstream of an assembly step (Z41) for components within the engine room of the vehicle body (W) and an assembly step (Z42) for components around the trunk or tailgate and upstream of a tire assembly step (Z43). This configuration improves workability by enabling the worker to perform the assembly operation without having to take difficult postures, and decreases the number of steps by avoiding scratches or dents to the bumper.
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