An atomizer has a liquid container containing a liquid to be atomized and an oscillator having a cylindrically shaped top part and protruding from the bottom of the liquid container. A pipe or a portion of the inner wall of the liquid container is sufficiently close to the outer surface of the top part of the oscillator so as to form a gap of 3 mm or less such that when the oscillator is caused to oscillate, its vibratory energy causes the liquid to reach the top surface of the oscillator and to be atomized. An inhalator is formed with such an atomizer made detachably attachable to a main housing. A coupling unit with two couplers connected with a cable may be used to attach the atomizer to the inhalator's main housing. A mouthpiece and a mask may be made attachable to the atomizer.