Horizontal and obliquely descending eddies due to breaking waves tend to have three-dimensional phenomena. There are a few studies on experimental observations of three-dimensional velocity distributions under the breaking waves. Thus, the formation of the horizontal and obliquely descending eddies are not completely explained at present. This study has experimentally found the generation condition of the horizontal and obliquely descending eddies and the three-dimensional velocity distribution under the wave breakings. As a result, the generation condition of the obliquely descending eddies is dependent on the breaking type index (Bt) and Reynold's number. Still more, the lateral velocity distribution has been found to be random in time and space.
