Ultrasonic atomizing unit

An ultrasonic atomizing unit comprising:

• an atomizing member comprising a circular thin plate-shaped piezoelectric vibrator having an opening at a central part thereof, and a vibrating plate that has a large number of micropores extending therethrough in a thickness direction thereof and is arranged so as to face the opening and so as to extend along one surface of the piezoelectric vibrator, the atomizing member ultrasonically vibrating the vibrating plate with the piezoelectric vibrator to atomize a liquid;
• a pair of annular elastic members arranged so as to extend along both surfaces, respectively, of the atomizing member and so as to be concentric with the atomizing member;
• and
• a holding member elastically sandwiching and holding the atomizing member through the pair of elastic members, wherein
• a maximum facing width in a radial direction between each annular elastic member and one surface of the atomizing member on one side in the radial direction from a center of the atomizing member is 40% of a radial direction width of the piezoelectric vibrator on one side in the radial direction from a center of the piezoelectric vibrator.