To provide a vibration device providing a high output with less vibration energy.

This vibration device has a vibration generator 10 with a piston as a vibrator built in a vessel 21, a vibration system is formed by the vibration generator 10 and spring members 13a, 13b, and vibration of the vibration system is transmitted to a vibration object 14 via a frame 12 serving as a holder. Natural frequency of the vibration system containing the vibrator 10 and spring members 13a, 13b is set within a frequency range formed in the vibration system by the vibration generator 10. The vibration system vibrates nearly on a resonant condition with a frequency near to the natural frequency, and the vibration output of the vibration generator 10 is amplified and transmitted to the vibration object 14. Thus, the vibration object 14 can be vibrated with a larger vibration force by a less vibration energy.