There is provided a high frequency glass antenna for automobiles which is capable of having an improved antenna gain without changing the shape of a defogger.A defogger, an antenna conductor, a feeding portion for the antenna conductor, a grounding conductor, and a grounding-side feeding portion for the grounding conductor are disposed in or on a rear window glass sheet for automobiles, the defogger forms at least one portion of the grounding conductor; and the grounding-side feeding portion is electrically connected to the defogger.