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The purpose of this study is to select the optimal and minimum transmittance for visual comfort in office buildings.This study progressed as follows. The first, we selected 5 films with various transmittance based on the current film makers whose films being used on the windows of office building nowadays and the case study of construction. And then we choose 6 kinds of transmittance as evaluation object including plain glass. The second, we made a mock-up models having different transmittance on the southern windows with model of real scale office building. The third, we selected 17 pairs of adjectives for the evaluation of visual comfort on interior or exterior conditions with transmittance factor. The fourth, subjective evaluation experiment was done using selected evaluation adjectives and the result was analyzed.The results are as follows ; 1) As a result of the factor analysis, we extracted two factor, [cleanvarious] and [amenityappropriateness] image, from the 16 evaluation items. 2) As a result of the multi regression analysis, it is concluded that the transmittance of the windows is the high effective physical item to two factor, [cleanvarious] and [amenityappropriateness], in simultaneous. 3) As a result of the average score analysis of evaluation item by transmittance, the first factor, [cleanvarious], get a more points as the transmittance is increased. And the second factor, [amenityappropriateness], get a most high score at 50% transmittance and decreased with higher transmittance than 50%. 4) Finally, the optimal transmittance range is concluded in 40%~60% and the minimum transmittance appropriate for the office building is 30%~ 60%.