Coast around Japan is rich in wave energy. In this study, we propose a method in which a pair of positive and negative pressure-resistant containers placed under the water surface are connected with pipe to produce unidirectional flow in the pipe under the wave condition. Since it can be placed underwater like a submerged dike, it is expected to be able to acquire energy during high waves with a low possibility of damage due to wave force of high waves. A prototype model was placed in a wave-making tank with two-dimensional configuration, and the flow velocity generated in the pipe connecting the pair of pressure resistant containers was measured. It was confirmed that it is possible to obtain a stable flow velocity under the regular wave condition, and that it is possible to increase the generated flow velocity with the increase of the wave height. In addition, it was clarified that the average flow velocity of about 65% of the regular wave can be obtained under the irregular wave condition, although the flow velocity becomes unstable.