The aim of this study is to provide a viable model of people's evaluation of offices and to explore ways of improving the quality of offices. An interview to office workers was made, and descriptive scales on which workers evaluate office environment were extracted. Workers were then asked to rate photographs of various offices on a series of selected scales. The data obtained was analysed by SSA 1, and the scales were classified into several groups, including "calmness", "comfortableness" and "elegance". An experiment using a scale model of an office was carried out in order to understand quantitatively the effects of layout, density and partition on the evaluation of office environment. With regard to the types of layout : the face-to-face type desk arrangement is rated fairly high in "comfortableness" and "elegance", but low in "calmness" ; the same-direction type desk arrangement is highly evaluated in "calmness", but low in other 2 items ; and the free type desk arrangemet is much appreciated in relation to the 3 items. With respect to density : there seems to be a density that obtains the highest evaluation depending on layout and the height of partitions. With the height of partitions : the 3 items in the free type desk arrangement and "elegance" in the same-direction desk arrangement have negative correlation, but in other cases the evaluation of the height of partitions varies depending on layout and density.