Recently, obesity that is increasingly becoming a major cause of various diseases and safety accidents in work places is emerging as a serious social problem. It is due to economic growth and improvement of living environments. Many researches are trying to find the root cause of obesity. Thus, the main objective of this study is to analyze obesity index of citizens in Seoul which is a metropolis of Korea and a densely populated district. The data used in this study included 179 men and 152 woman subjects who are living in Seoul. Somatotype using Rohrer Index can be classified by 3 types (thin, standard, obesity). In order to analyze a detailed somatotype of citizens, age groups are divided into 30~34, 35~39, 40~49, and 50~59 years according to gender, respectively. In order to compare and analyze data, Coefficient of Variance, Cronbach's Alpha, Rohrer Idex and Drop Value were used in this study. The results of this study can be applied to the comfortable and safe work environments for workers.