A case of adrenal myelolipoma is presented. A 39-year-old woman was admitted to our hospital for further examination of a right adrenal mass, which was found by examination for nausea, vomiting and upper abdominal pain. Imaging analyses by computed tomography and magnetic resonance imaging revealed a round fatty mass. Endocrine study of the adrenal gland showed normal results. Right adrenalectomy was performed. The tumor weighed 240 g and the histological diagnosis was adrenal myelolipoma. Postoperative course was uneventful and upper abdominal symptoms disappeared after surgery.