Field measurements on vegetation and beach profile in the backshore at the Hasaki coast where the landward wind was predominant showed that accumulation occurred continually in the backshore with vegetation, whereas erosion occurred without vegetation. In the backshore with vegetation, a strong wind with a speed over 20 m/s exposed the root of vegetation, killed the vegetation, and generated small bare areas. The elevation in the bare areas got higher with landward winds with a speed of 12 to 15 m/s, and got lower with seaward winds. The small bare areas were expanded by the next strong wind, combined with neighboring ones, and developed to large ones. Field examinations of the countermeasures against erosion in the backshore caused by wind showed that covering the ground with straws and planting American dunegrasses was most effective. However, even without countermeasures, when vegetation did not experience the strong wind for more than a year and was not damaged by an extraordinarily high temperature, the vegetation naturally recovered and protected the backshore.