PURPOSE: To easily obtain the installation strength for a car body even if the shape dimension is small, by constituting a stay integrally from a stay body and a stay cover body which are separatedly injection-molded.

CONSTITUTION: An automobile spoiler consists of a spoiler body 21 and a spoiler stay 1 which is molded separately from the spoiler body 21. The stay 1 consists of a stay body 3 which is injection-molded separatedly and a stay cover body 11. In this case, the stay body 3 consists of a cylindrical spoiler side installation part 5 whose top edge part is formed to an installation seat part having an installation hole and a car body side installation part 7 which is formed continuously at the root part of a spoiler side installation part 5. Further, the stay cover body 11 is positioned between the spoiler side installation part 5 of the stay body 3 and the spoiler body 3 and fixed integrally.