Concrete walls and concrete structures are often associated with hardness and coldness. However, with the change of sunshine, concrete walls give some changes of impression. The psychological measurements with nine seven-rated-scales were conducted for nine architectural concrete specimens with variety of surface finishing under the various conditions of sunshine. We measured the illuminance and the color of the surface of concrete specimens with various sunshine conditions. The results are as follows : People are impressed as warm by the high illuminance of the vertical plane or by taking on a red tinge of sun light, and impressed as cold by the low illuminance of the vertical plane. People are impressed as abundant, light and soft by the change of incident angle of sun light, and impressed as poor, heavy, and hard by the low illuminance of the vertical plane.
