The present invention relates to a composition containing a Borage officinalis extract for alleviating, preventing, or treating metabolic diseases and, more specifically, to a composition containing a Borage officinalis extract as an active ingredient for alleviating, preventing, or treating a metabolic disease selected from obesity, diabetes, dyslipidemia, fatty liver, and insulin resistance syndrome. The composition of the present invention exhibits excellent effects of inhibiting fat cell differentiation, reducing abdominal fat, and improving blood lipids.