PURPOSE: A ventilation device is provided to reduce manufacturing costs by reducing a radar cross section without additional equipment and to maximize a stealth effect. CONSTITUTION: A ventilation device(1) comprises a body(10) and a cover(20). The body is formed in an octagonal shape and has an air flow path connected to a vehicle. The cover is installed on the top of the body to be connected to the air flow path and has a bigger octagonal cross section than the body. An outlet is formed in the cover. Air is discharged to the outlet through the air flow path.
