This study was conducted to investigate adolescents` body size and their concerns and perceptions about body image. Group means of heights and weights were 171.5㎝ and 60.3㎏ for boys and 159.3㎝ and 52.3㎏ for girls. Body Mass Index(BMI) of the subjects were 20.5 for boys and 20.6 for girls. Only 11.5% of subjects were overweight or obese, however 42.5% of subjects had experienced weight control, and the main reason for weight control was to lose weight(80.6%). In concern for body image and frequency of eating disturbance; females had more concern than males, the group who had attempted weight control had more concern than those who had not, and the group who were overweight had more concern than those who were under- and normal weight. In perception about body image, using a set of nine figure drawings arranged from very thin to very heavy figures, subjects rated their current figure, considered figure(how they appeared to others), ideal figure, and attractive figure. For boys, the current, ideal, and most attractive figures were almost identical, but for girls, the ideal figure was significantly thinner than current figure and attractive figure was significantly thinner than current figure. The greater the preference for thinner figure as ideal and attractive figure, the higher the concern for body image and frequency of eating disturbance. Thus it seems that a distorted perception of ideal body size affects adolescents` concern for body image and eating behaviors. (Korean J Community Nutrition 2(2) : 197~205, 1997)