A glass antenna for use in a back door made from resin to be openably and closably attached to a rear portion of a vehicle, wherein the glass antenna comprises: a defogger comprising a plurality of heating wires and at least two bus bars (32A and 32B) which connect end portions of the heating wires so as to supply electric power to the heating wires ; a first antenna wire which is disposed in a peripheral region of the defogger , along at least three sides of the defogger , configured so as to receive radio waves in a first frequency band; a second antenna wire which is disposed in the peripheral region of the defogger , configured so as to receive radio waves in a second frequency band which is higher in frequency than the first frequency band; and an amplification portion which is configured to synthesize and amplify a first reception signal received by the first antenna wire and a second reception signal received by the second antenna wire , and wherein the first antenna wire is an Amplitude Modulation antenna and is disposed at a first distance (D1) or longer from the defogger ; and the second antenna wire is a Frequency Modulation antenna and is disposed at a second distance (D2) from the defogger , the second distance (D2) being shorter than the first distance (D1); and the first distance (D1) is 40 mm, and the amplification portion is connected to the first antenna wire through a first feeding point and connected to the second antenna wire through a second feeding point ; and the first feeding point is disposed in the peripheral region and outside a line (L1) along each of the at least two bus bars (32A and 32B) and an extension line of the line (L1). a defogger comprising a plurality of heating wires and at least two bus bars (32A and 32B) which connect end portions of the heating wires so as to supply electric power to the heating wires ; a first antenna wire which is disposed in a peripheral region of the defogger , along at least three sides of the defogger , configured so as to receive radio waves in a first frequency band; a second antenna wire which is disposed in the peripheral region of the defogger , configured so as to receive radio waves in a second frequency band which is higher in frequency than the first frequency band; and an amplification portion which is configured to synthesize and amplify a first reception signal received by the first antenna wire and a second reception signal received by the second antenna wire , and wherein the first antenna wire is an Amplitude Modulation antenna and is disposed at a first distance (D1) or longer from the defogger ; and the second antenna wire is a Frequency Modulation antenna and is disposed at a second distance (D2) from the defogger , the second distance (D2) being shorter than the first distance (D1); and the first distance (D1) is 40 mm, and the amplification portion is connected to the first antenna wire through a first feeding point and connected to the second antenna wire through a second feeding point ; and the first feeding point is disposed in the peripheral region and outside a line (L1) along each of the at least two bus bars (32A and 32B) and an extension line of the line (L1). <EOS>