Disturbance which most effectively causes the vibration of a dynamical system is defined as “the worst disturbance” and is formulated theoretically by using H_∞ control theory in the part 1 of the paper. Objective of the present study is to verify experimentally the characteristics of the worst disturbance on flexible structures obtained numerically in the forgoing paper. Flexible structures are modeled by a Euler-Bernoulli beam and hardware experiment is developed in this paper to verify the validity of the numerical simulation. The experimental apparatus consists of a free-free flexible aluminum beam suspended at two points, non contacting electro-dynamic force actuator and sensors employed with an accelerometer and strain gages. Good agreement is obtained between the result of numerical simulation and the experimental result.