To improve attachment work by simplifying attachment of an antenna device built in vehicle exterior equipment, and a structure of fixing.

The antenna built-in vehicle exterior equipment (roof spoiler 2) is attached to an outside of a vehicle body of a vehicle, incorporates the antenna device 5, and has an upper panel 3 and a lower panel 4 joined by means of vibration solvent welding. A projection for the first vibration solvent welding (vibration solvent welding rib 10) is formed on an inner wall face side of either of the upper panel 3 or the lower panel 4, and the antenna device 5 is arranged on an antenna device arrangement part 9 that is located on the inner wall side of either of the upper panel 3 or the lower panel 4. A projection for the second vibration solvent welding (solvent welding rib 11 for the antenna device), vertically provided in the antenna device arrangement part 9, is inserted in an antenna device insertion hole 15 of an antenna element 6 comprising the antenna device 5 to regulate the width direction of the element, which enables to position and temporarily put the antenna device.