To realize a force-applied state adapted to deformation acting actually on a vibration damper, in a dynamic force application test performed for grasping the dynamic characteristic of the vibration damper or the like.

A translation-direction displacement (X, Y) inside a flat surface in at least one direction and a rotational displacement (Rz) inside the flat surface generated on a three-axis vibrating base 1, are input via a force applying jig 4 and a force applying arm 3 extended from the bed 2 of the vibrating base 1 up to a fixed bed 5 in its periphery, to a test body 10 installed via a plurality of two-axis component force meters 20 on the fixed bed 5, and measurement of the amount of displacement of the test body 10 and load measurement by the meters 20 are performed.