In this paper, wave drift speed of a floating body is discussed. Measurements of wave drift speed were conducted on both two-dimensional floating body and three-dimensional floating body. Then, an estimation method of wave drift speed was derived from the analysis of measurement results. The mechanism of wave drift speed varies with wavelength. In short wave range, wave drift force due to wave scattering pushes the floating body. Therefore, drift speed is decided by the equilibrium of wave drift force and fluid drag and it is proportional to the wave slope. In long wave range, on the other hand, wave drift force hardly acts on the floating body, because wave almost transmits the floating body. Therefore, the drift speed is decided by the wave-current speed and it is proportional to the square of the wave slope. Taking these wave drift mechanisms into consideration, an estimation method of wave drift speed, which covers entire wave range, is proposed.
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