In this paper, Korean's dining-out behaviors were compared and investigated according to gender and age. The change and the problem of dietary pattern in Korea were understood and we intend to provide the basic information for guidelines of Korean's dietary habits. The subjects are composed of 46.5% male and 53.5% female. According to age, groups aged 10~19 are 26.3%, 20's are 24.6%, 30's are 16.8%, 40's are 18.7%, and 50 and over age group is 13.6%. All of the age groups ate out for celebration of a special day or for social purposes. When dining-out, the most important criteria for selecting a restaurant was the taste of food. All age groups liked Korean-style restaurants the most. All age group eat a house meal at breakfast. At lunch, age groups 40 and below go to a restaurant in school or company and 50 and over age group eats house meal. In general, all age groups ate a house meal at dinner. At breakfast, all the age groups do not eat out. For lunch, they eat out four or five times a week. For dinner, the most of age groups except the 20's eat out two or three times a month and for the 20's age group, two or three times a week. The reason for selecting a Korean-style restaurant is that the food is 'well matched with one's appetite'. According to the above results, the dietary habits of 30 and over age groups are relatively good. On the other hand, in 10's and 20's age groups, they have an irregular meal and the ratio of skipping a meal is high. And they frequently use fast-food restaurants. In the future, the unbalance of nutrition in these age groups is expected. Therefore, the correct nutritional facts should be educated so that these age groups have a healthy dietary habit.