This paper is to investigate wave and current interaction which is an important physical field in the vicinity of river mouth. Hydraulic model experiments have been carried out. In the experiments, changes in the wave heights, flow pattern on bed and horizontal velocities trajectory are observed for current velocities and oblique incident waves under wave-current coexisting fields. In particular, the combined effects of both velocity components under interaction between wave and current indicate to affect to flow field through the horizontal velocities trajectory. It is suggested that there is close relationship between wave-current interaction and sediment transport near river mouth.