An air induction device for use in a motor vehicle. The vehicle has first and second air passages through which outside air and inside air pass respectively. The air induction device comprises a casing in which a motor-driven blower fan is installed. The casing has upper and lower portions. The upper portion has at least two openings which are respectively connected to the first and second air passages and selectively closed and opened by a door structure. The lower portion includes a bottom wall portion and two inclined side wall portions which are raised from a periphery of the bottom wall portion. An outlet passage conveys air from the interior of the casing to a remote position. The two inclined side wall portions are formed with respective lower inlet openings which are connected to the second air passage and selectively closed and opened by respective pivot doors. Each door is arranged to pivot outside the casing.
