<p>An air pump device comprises an electric motor 12, a low and a high pressure type pump 16, 18 disposed at opposite ends of a rotary shaft extending from the motor and connected in series to each other through a discharge tube 16b from the low pressure type pump extending to a suction port of the high pressure type pump, and an air suction tube 16c connected via a valve 20b to the discharge tube downstream of a change-over valve 20a disposed in the discharge tube.</p>
