VIBRATION TESTING APPARATUS

PROBLEM TO BE SOLVED: To provide a vibration testing apparatus capable of suppressing unbalanced vibration which may be generated when vibration is applied to a test object having different rigidity characteristics in an extension direction and a compression direction.SOLUTION: A vibration testing apparatus 1 acquires a range W of expected values allowed to be taken by a mean value M of load vibrations for a command signal C to an actuator 15, and when the mean value M of load vibrations measured by a load cell 16 is included in the range W of the expected values in a transient state before stabilization of the load vibrations, generates the command signal C so that increment of an amplitude value Ac from an immediately preceding command signal C' exceeds twice the variation of a mean value Mc from the immediately preceding command signal C', and when the mean value M of load vibrations is not included in the range W of the expected values, the command signal C is generated so that the increment of the amplitude value Ac from the immediately preceding command signal C' becomes twice or less the variation of the mean value Mc from the immediately preceding command signal C'.