A multiple throttle device 100 includes: a throttle body 12 having a plurality of intake passages 10; a plurality of throttle valves 20; a plurality of secondary passages 102 respectively bypassing the plurality of throttle valves 20; and an air amount adjustment valve 30 for adjusting an amount of air flowing through the plurality of secondary passages 102. The air amount adjustment valve 30 includes a valve plug 40, and a guide part 50 for guiding the valve plug 40 in the axial direction. Opening into the inner peripheral surface 51 of the guide part 50 are: a plurality of first communication holes 52 respectively communicating with downstream sides of the throttle valves 20 in the plurality of intake passages 10; and a second communication hole 54 communicating with a canister 9 for collecting fuel vapor. The actuator 60 adjusts a position of the valve plug 40 in the axial direction such that a first effective opening area of each of the first communication holes 52 which is not blocked by the valve plug 40 and a second effective opening area of the second communication hole 54 which is not blocked by the valve plug 40 change.