In this study, we analyzed the clinical courses and the pregnancy outcomes in Japanese women with inflammatory bowel disease (IBD) in our hospital in the recent 10 years. We analyzed 49 pregnancies in 38 patients with ulcerative colitis (UC) and 24 pregnancies in 16 patients with Crohn's disease (CD) retrospectively. The results indicated that pregnancy has less influence on the clinical courses of IBD and that IBD also has less influence on the pregnancy outcomes. However, we should pay attention to the results that the patients with CD tend to deteriorate if conception occurs when CD is active and that patients with active UC tend to have more adverse pregnancy outcomes than patients in remission. In conclusion, patients with IBD are recommended to become pregnant when the diseases are in remission and treatment using selected safe medications should be continued during the pregnancy.