A glass antenna to be arranged on a window glass of a vehicle, comprising: a first antenna configured to receive a radio wave in a first frequency band; and a second antenna configured to receive a radio wave in a second frequency band having a frequency that is approximately half of a frequency of the first frequency band, the first antenna including a core-side feeding unit and an earth-side feeding unit to be coupled to a receiver, a core-side element extended from the core-side feeding unit, and an earth-side element extended from the earth-side feeding unit, the core-side element being formed by being bent and having a length approximately equal to a length obtained by multiplying a wavelength at a center frequency of the first frequency band by a wavelength shortening rate of glass, whereby the core-side element includes a first line containing a first position which is at a distance αλ /4 from the core-side feeding unit along the core-side element and a second line containing a second position which is at a distance 3 αλ /4 from the core-side feeding unit along the core-side element when the wavelength at the center frequency of the first frequency band is λ, and the wavelength shortening rate of the glass is α, and the first line and the second line are positioned in parallel to each other, wherein the core-side element includes a first horizontal line coupled to the core-side feeding unit to be extended in a horizontal direction, a second vertical line extended upward from the first horizontal line, a second horizontal line extended from the second vertical line in the horizontal direction, a third vertical line extended upward from the second horizontal line, a third horizontal line extended from the third vertical line in the horizontal direction, and a fourth vertical line extended downward from the third horizontal line, wherein the second vertical line contains the first position, wherein the fourth vertical line contains the second position, and wherein the second vertical line is positioned between the fourth vertical line and the core-side feeding unit in the horizontal direction. a first antenna configured to receive a radio wave in a first frequency band; and a second antenna configured to receive a radio wave in a second frequency band having a frequency that is approximately half of a frequency of the first frequency band, the first antenna including a core-side feeding unit and an earth-side feeding unit to be coupled to a receiver, a core-side element extended from the core-side feeding unit, and an earth-side element extended from the earth-side feeding unit, the core-side element being formed by being bent and having a length approximately equal to a length obtained by multiplying a wavelength at a center frequency of the first frequency band by a wavelength shortening rate of glass, whereby the core-side element includes a first line containing a first position which is at a distance αλ /4 from the core-side feeding unit along the core-side element and a second line containing a second position which is at a distance 3 αλ /4 from the core-side feeding unit along the core-side element when the wavelength at the center frequency of the first frequency band is λ, and the wavelength shortening rate of the glass is α, and the first line and the second line are positioned in parallel to each other, wherein the core-side element includes a first horizontal line coupled to the core-side feeding unit to be extended in a horizontal direction, a second vertical line extended upward from the first horizontal line, a second horizontal line extended from the second vertical line in the horizontal direction, a third vertical line extended upward from the second horizontal line, a third horizontal line extended from the third vertical line in the horizontal direction, and a fourth vertical line extended downward from the third horizontal line, wherein the second vertical line contains the first position, wherein the fourth vertical line contains the second position, and wherein the second vertical line is positioned between the fourth vertical line and the core-side feeding unit in the horizontal direction.