Pregnancies in patients with Addison's disease and Diabetes mellitus are rarely observed. A case of pregnancy in such patient is reported. The course of pregnancy and the fetal development show, that pregnancy can be finished without great problems, if there is therapeutical full compensation of metabolic derangement by hydrocortisone and insulin. There are less complications due to Addison's disease than to Diabetes mellitus. Thus the management of delivery should be the same as in isolated Diabetes mellitus.