Laboratory tests are conducted to measure the impact pressures of breaking waves on vertical, 5-degrees forward, and 5, 10, 20, 30, and 45-degrees backward sloping walls. The base structure of the wall has a foreshore slope of 1/10. Regular waves are used throughout the experiments for all wall angles. The maximum impact pressures on the wall are shown to satisfy the log-normal probability distribution. It is found from the present experiments that the impact pressures and resulting forces on sloping walls can be greater than those on a vertical wall. On the seven different walls tested, the maximum impact pressures occur most frequently slightly below the still-water level. The pattern of the impact pressure history does not change with the slope of the wall, and as the probability of maximum impact pressure decreases, the pressures around the peak pressure region of the impact pressure histories remain longer.