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Primary hyperaldosteronism or Conn's syndrome is rare after renal transplantation. We present a case of a 34-year-old woman with end-stage renal disease, who had received a living renal transplant and showed persistent hypertension and hypokalemia. The common causes of hypertension after kidney transplantation were excluded and hypokalemia persisted despite potassium supplementation and angiotensin converting enzyme inhibitors. Biochemical findings revealed extremely elevated plasma aldosteron levels, suppressed plasma renin activity, and massive urinary potassium wasting. Abdominal computerized tomography scan showed a left 25-mm adrenal nodule. Her hypertension and hypokalemia was cured by the removal of the adenoma.