In recent years, it clearly shows the tendency toward the utilization of daylight in many exhibitory buildings such as museum since the expectation of visitors for whom high illuminance levels are preferable to perceive the details of the works of art. Shading devices and special glazings are often used as the tool to control the amount of light and heat which should be avoided for the presentation of high-light sensitive art works such as paintings. Another way of controling the light is to provide the space for inducing and attenuating light in the exhibitory building. This study aims to investigate the illuminance on the exhibitory space when the space for inducing and attenuating light is applied. Interaction between the daylight and the space was simulated by Lumen Micro program with variation of the size of the exhibitory space, the length of inner wall, surface reflectivity, area of windows to obtain the illumination of the wall surface. This study shows that those variables affect the illumination on the wall surfaces. By comparing the results with suggestive illumination of KS and ICOM, available wall for display on natural lighting are suggested for the seasons and time.