PURPOSE: To instantaneously atomize fuel, by arranging a hollow cylindrical vibrator in such a manner as to partly surround an injection port of a fuel injection valve in a device which injects the fuel into an intake pipe from the fuel injection valve.

CONSTITUTION: A fuel injection valve 18 provided to a prescribed position of an intake pipe 11 is mounted to the pipe 11 through an atomizer device 21 of injected fuel, and the device 21 is fixed to the pipe 11 by bolts 28 with an aluminum casing 14 of the device 21 through an insulator ring 16. This device 21 is constituted such that a hollow cylindrical vibrator 15 consisting of electrostrictive strain ceramic of barium titanate or the like is contained in the casing 14 and fixed by a fixing member 14b, and voltage having a resonance frequency is applied to electrodes 22, 23 baked on both internal and external surfaces of the vibrator to generate respiratory vibration in the vibrator 15 in the direction X-X', then fuel is injected to the center A of the respiratory vibration and instantaneously atomized.