A glass antenna arranged on a window glass for a vehicle, comprising a first antenna and a defogger configured to function as a third antenna, wherein the third antenna is further configured to form a diversity with the first antenna, wherein: the first antenna includes: a first power feeding point connected to a receiver; a first element connected to the first power feeding point; and a second element (21, 22) connected to the first power feeding point, the first power feeding point is arranged in proximity to a side of the window glass, the second element includes: a main body portion extending from the first power feeding point; a folded portion connected to the main body portion, and the folded portion is folded back from the main body portion and is arranged along the main body portion, an element of the first antenna is arranged in proximity to the defogger arranged on the window glass so as to be capacitively coupled to a heating wire of the defogger; the third antenna is composed by using the heating wire of the defogger as an antenna; and the third antenna includes a third power feeding point, the third power feeding point being connected to the receiver; and characterized in that: the glass antenna is configured to receive signals on a first frequency band having a wavelength of a center frequency set as λ 1 and a second frequency band having a wavelength of a center frequency set as λ 2; and the folded portion has a length of approximately α λ 2 /4, the main body portion has a length of approximately α λ 1 /5, and the first element has a length of approximately α λ 1 /6, where α represents a wavelength shortening rate of the window glass. the first antenna includes: a first power feeding point connected to a receiver; a first element connected to the first power feeding point; and a second element (21, 22) connected to the first power feeding point, a first power feeding point connected to a receiver; a first element connected to the first power feeding point; and a second element (21, 22) connected to the first power feeding point, the first power feeding point is arranged in proximity to a side of the window glass, the second element includes: a main body portion extending from the first power feeding point; a folded portion connected to the main body portion, and a main body portion extending from the first power feeding point; a folded portion connected to the main body portion, and the folded portion is folded back from the main body portion and is arranged along the main body portion, an element of the first antenna is arranged in proximity to the defogger arranged on the window glass so as to be capacitively coupled to a heating wire of the defogger; the third antenna is composed by using the heating wire of the defogger as an antenna; and the third antenna includes a third power feeding point, the third power feeding point being connected to the receiver; and characterized in that: the glass antenna is configured to receive signals on a first frequency band having a wavelength of a center frequency set as λ 1 and a second frequency band having a wavelength of a center frequency set as λ 2; and the folded portion has a length of approximately α λ 2 /4, the main body portion has a length of approximately α λ 1 /5, and the first element has a length of approximately α λ 1 /6, where α represents a wavelength shortening rate of the window glass. the glass antenna is configured to receive signals on a first frequency band having a wavelength of a center frequency set as λ 1 and a second frequency band having a wavelength of a center frequency set as λ 2; and the folded portion has a length of approximately α λ 2 /4, the main body portion has a length of approximately α λ 1 /5, and the first element has a length of approximately α λ 1 /6, where α represents a wavelength shortening rate of the window glass.