We investigated oscillations of smectic bubbles induced by exposure to an acoustic sound. In the frequency range of 10 ~ 2000 Hz, the bubbles exhibited clear oscillations at the same frequencies as those of the input sound waves. Changing the frequencies, we found that the amplitude of the oscillation took the relative maximum, in which the input frequency should be equal to the resonant frequency of the bubble. The obtained resonant frequencies well agreed with the calculation based on the model for soap bubbles.
