PURPOSE: To provide an air guiding device which has the whole surface of a window to prevent insects from adhesion thereto without increasing air resistance.

CONSTITUTION: A deflecting plate 14 extending in the direction of the width of a car is arranged to the engine hood 12 of an automobile body 10. The section, as seen from the direction of the width of a car, of the deflecting plate 14 is formed in a V-shape and a mounting part 14A is fixed to the upper surface 12A of the engine hood 12. Further, a fairing plate 14B is formed in a state to extend from the front end of the mounting part 14A and point toward above the rear side of a car body. An arrival plate 24 extending in the direction of the width of a car is arranged to the upper end part 22A of a front window 22 and an arrival part 24B extending from the upper end of the mounting part 24A of the arrival plate 24 toward the deflecting plate 14 is formed.