AIR SPOILER DEVICE

PURPOSE:To provide an air spoiler device which can realize stability against cross wind and stability for high speed direct advance and reduce air resistance. CONSTITUTION:A front skirt 3 is arranged in the front bottom section of a vehicle 1 in such a way that it is stored and developed freely downward, and a front side fin 8 is provided on the side of the skirt 3 in such a way that the condition where it advances along relative wind and the condition where it stops the flow of relative wind can be changed over. When car speed which is measured by a car speed sensor 15 is higher than the predetermined speed and cross wind is weaker than the predetermined strength when measured by a cross wind sensor 16, an ECU 14 controls a development-storage motor to develop the skirt 3 and fin 8 downward from the vehicle and controls a motor for fin to put the front side tin 8 along the flow of relative wind. When car speed is higher than the predetermined speed and cross wind is stronger than the predetermined strength, it develops the skirt 3 and fin 8 downward of the vehicle and puts the front side fin 8 in the condition where the fin 8 stops the flow of relative wind.