PROBLEM TO BE SOLVED: To provide a vibration testing device that reduces the burden on an operator.;SOLUTION: A vibration testing device comprises: a vibration table mounted with an object; an actuator which has a piston coupled to the vibration table in one body and a cylinder which is cylindrical and has its inside partitioned by the piston into a first pressure chamber and a second chamber in the axial direction of a center axis and also has a predetermined length in the axial direction, internal sectional area by a plane perpendicular to the axial direction being constant in the axial direction; a hydraulic oil supply part which supplies hydraulic oil having a predetermined volume elasticity to the first pressure chamber and second pressure chamber by switching so as to let the piston reciprocally move in the cylinder between a first pressure chamber side and a second pressure chamber side; a control part which controls the supply operation for the hydraulic oil by the hydraulic oil supply part to let the piston reciprocally move axially at a predetermined excitation frequency; and a volume adjustment part which has a capacity-variable chamber capable of varying in capacity and accommodating the hydraulic oil, the capacity-variable chamber being linked to at least one of the first pressure chamber and second pressure chamber of the cylinder.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2019,JPO&INPIT
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