To measure a property of a measuring object nondestructively by three-point supporting.

This vibration measuring method includes the first process for applying a sound wave vibration to the measuring object by an excitation signal generation device, the second process for monitoring the sound wave vibration applied by the excitation signal generation device, the third process for receiving vibration of the measuring object by a vibration sensor, and the fourth process for acquiring the signal received by the monitor and the vibration sensor and analyzing a characteristic of the measuring object. This device has characteristics wherein the excitation signal generation device and the vibration sensor are installed on the same circumference so that an angle becomes perpendicular which is formed by a straight line passing the center point O of the measuring object and a contact point A between the excitation signal generation device and the measuring object and a straight line passing the center point O and a contact point B between the vibration sensor and the measuring object, and a support point C is installed on the same circumference so that each angle formed by the straight line AO and a straight line CO and by the straight line BO and the straight line CO becomes equal, and the measuring object can be measured by the three-point supporting.