Reports measurements of wind pressure distributions on the surface of a rectangular cylinder model in a wind tunnel. Finds fluctuating character of pressure on roof surface is dependent on the turbulent structure of wind tunnel flow. Experiments were also made on box-shaped models with square section. Finds windpressure distribution on the roof became uniform with increasing height of the model. Gives diagrams of wind pressure coefficients. Finds in a diagonal wind direction to the model, the two points symmetrical about the diagonal line of the roof surface are affected by alternatively fluctuating pressure with considerable amplitude.