PROBLEM TO BE SOLVED: To provide an ultrasonic atomization device enhancing the diffusibility of an atomized liquid.SOLUTION: An ultrasonic atomization device 1 includes: a liquid-absorbing wick 22 absorbing a chemical liquid from a chemical liquid container 20 and a vibrating plate 32 having a large number of micropores 36 penetrating in the thickness direction, and atomizing and spraying the chemical liquid supplied through the liquid-absorbing wick 22 by the vibration of a piezoelectric oscillator 31 generating ultrasonic vibration by current carrying. The vibrating plate 32 has a truncated cone-shaped projecting part 37 supplied with the chemical liquid through the liquid-absorbing wick 22.COPYRIGHT: (C)2014,JPO&INPIT