Antenna device

An antenna device attachable to a bottom surface of a resin or glass body of a vehicle, the antenna device comprising:

• an antenna element that has a receiver for receiving radio waves;
• a circuit board that has a circuit surface having a circuit formed thereon to amplify signals inputted from the antenna element;
• a shield cover that covers the circuit surface of the circuit board to shield the circuit from interference waves and that is grounded;
• a coaxial cable that is inserted into the shield cover, that supplies a driving power to the circuit formed on the circuit board, that connects the circuit to a ground (GND) by an outer conductor of the coaxial cable being connected to the shield cover and a GND potential being supplied to the shield cover, and that outputs signals from the circuit;
• and
• a metallic bracket that has a lateral wall surrounding a lateral side of the antenna element and a bottom wall supporting a bottom of the antenna element, wherein the shield cover is mounted on the bottom wall so that the antenna element is supported by the metallic bracket.