AIR AMOUNT ADJUSTMENT VALVE AND MULTIPLE THROTTLE DEVICE

A multiple throttle device includes: a throttle body having a plurality of intake passages ; a plurality of throttle valves ; a plurality of secondary passages respectively bypassing the plurality of throttle valves ; and an air amount adjustment valve for adjusting an amount of air flowing through the plurality of secondary passages . The air amount adjustment valve includes a valve plug , and a guide part for guiding the valve plug in the axial direction. Opening into the inner peripheral surface of the guide part are: a plurality of first communication holes respectively communicating with downstream sides of the throttle valves in the plurality of intake passages ; and a second communication hole communicating with a canister for collecting fuel vapor. The actuator adjusts a position of the valve plug in the axial direction such that a first effective opening area of each of the first communication holes which is not blocked by the valve plug and a second effective opening area of the second communication hole which is not blocked by the valve plug change.