The purpose of this study is to make a eating behavior questionnaire and to examine the causes that regulate eating behavior. The questionnaire was consisted of 40 items which might effect the multiple modern eating behavior. The result of factor analysis gave 4 factors : 1) overeating, 2) diet, 3) tendenciousness for perfect eating life, 4) eating with too much consciousness to the others. Next factor scores were subjected to analysis of variance (ANOVA) to examine the effects of sex, eating style, concern for diet, experience for diet and BMI. The results obtained were as follows : 1) Factor scores of factor 1 to 4 to women were higher than men. 2) Factor scores of factor 1, 2 and 3 to persons who concerned diet or experiensed diet were higher than other persons. The results of this study indicated that eating behavior was effected by many factors; sex, concern for diet, experience for diet and so on.