A high frequency wave antenna for an automobile is provided, which improves antenna gain of an antenna conductor provided in a spoiler. A defogger is provided on a rear window glass plate 14, a part of a plurality of heater wires extend in a horizontal direction, a spoiler including an antenna conductor 6 embedded therein is provided above the rear window glass plate 14, at least one of a plurality of bus bars has a bus bar horizontal portion 1H extending in a horizontal direction, the bus bar horizontal portion 1H is provided in an upper region of the rear window glass plate 14, and a plurality of vertical heater wires 2 extending in a vertical direction from the bus bar horizontal portion 1H, are provided.