Purpose : This study is descriptive research that confirms regularity of breakfast and related factor. Methods : The duration for investigation took place from April to May 2007 and 550 middle students of 6 middle school who lived in G city participated in investigation. The contents of the questionnaire consist of general trait, diet trait, life pattern and health state. Results : The significant variables of regularity of breakfast habit have some gender differences. For male students, recognition of importance of the breakfast, breakfast preparer, spare time before attendance and one's parents' breakfast habit are significant variables. On the other hand, for female students, recognition of importance of the breakfast, breakfast preparer and an income level are significant variables(p<.05). For male students, the cross ratio has 3.52 for recognition of importance of breakfast, 2.72 for one's parents' breakfast habit, 2.05 and 3.13 when one's mother prepare breakfast. For female students, the cross ratio is 3.24 score when one's mother prepare breakfast. Conclusion : The regularity of breakfast habits is related to recognition of importance of breakfast, mother's breakfast preparation and his or her parents'breakfast habit. It is necessary to propose the importance of breakfast to improve the regularity of breakfast habit and concern of parents for breakfast.