The light is the source of the life and energy to the human, which enables to grasp the objects and situation as well as to feel the flow of the space and time, besides providing the human with indispensible elements. The light in the architectural space has long existed in the history and it still remains as one of the critical architectural elements. However the illumination design focusing on convenience only has used functional artificial lighting for reasons of timesaving and difficulties in handling the natural light. Then amid the growing interest in ecological architecture throughout the world, the natural light has been in the limelight again as immaterial energy-saving material. The human accommodates the light through the sense of sight and recognizes the space and obtains the knowledge, and based on those, the symbolism is granted to the architectural space created by the light and the orientation is indicated. The light and shade created by the light have the variability in line with the time that never remains intact even a minute or a second. Thanks to such characteristic, the architectural space accommodating the light tends to be represented by the element, dubbed the light. The study, focusing on Ando Tadao’s Works, was intended to view what the characteristics of the light in the space would be and what the role of the light in changing the characteristics of the architectural space is. Ando Tadao is one of the architects using the natural light as the most important architectural element in the East. He has created tremendous spaces using the light in his works and created the various works to which he has given a variety of meaning more than the existence of the space itself. Hence the study was aimed at interpreting the architectural space created by the light of Ando Tadao based on visual perception theory and reappraising the characteristics of the space by the light, as well as analyzing the light and space from the another viewpoint.