Air-intake duct for vehicle and vehicle

An air-intake duct (19) for a vehicle, which couples a throttle device (18) for controlling an air-intake amount of an engine (15) to an air cleaner (20) for cleaning air guided to the throttle device (18); includes a tubular wall (19a) forming an inlet (19f) through which air from the air cleaner (20) flows into the air-intake duct (19); an outlet (19d) through which the air flows out to the throttle device (18); and an air-intake passage (39) connecting the inlet (19f) to the outlet (19d); the tubular wall (19a) including an injector attaching portion (19h) to which an injector (28) for injecting a fuel to the air-intake passage (39) is attached, and the injector attaching portion (19h) having a fuel injection opening section (19i) communicating with the air-intake passage (39).