Objectives: Drinking alcohol during pregnancy can adversely affect the health of the pregnant woman and the fetus. Although the drinking alcohol rate of Korean women is gradually increasing, studies on the drinking alcohol rate of pregnant women during pregnancy are insufficient. In particular, few studies have been conducted on the variables that can predict drinking alcohol behavior during pregnancy. Methods: In 2017, we administered a self-report questionnaire for pregnant women less than 30 days before the due date of visiting a university hospital and a specialized hospital. We investigated the demographic and obstetric characteristics, as well as the drinking alcohol history of pregnant women. Results: The average age of 306 subjects was 33.4±4.2, and the average years of education was 15.3±1.8. In the CAGE, 17.0% responded ‘yes’ to more than two questions, and 37.6% responded if they had ever experienced a blackout or blackouts. The rate of drinking alcohol during pregnancy was 27.1%, including the period when respondents were unaware of being pregnant. And after respondents became aware of being pregnant, 7.2% experienced drinking alcohol. Significant variables explaining pregnant women who continue to drink alcohol even after knowing that they are pregnant were: the education of pregnant women (p<.001), family history of drinking alcohol (p<.05), and experiences of drinking alcohol before becoming pregnant (p<.05). Conclusion: The results of this study showed that a large number of pregnant women continued to drink alcohol during pregnancy. Thus, these results suggest that more non-drinking alcohol pregnant women should devise appropriate anti-drinking alcohol education programs for pregnant women who drink alcohol during pregnancy.