Continuous epidural catheter insertion is common practice in postoperative analgesia. Subarachnoid migration of epidural catheter is a rare complication. Presumed delayed subarachnoid migration of an epidural catheter occured in a 58-year-old female patient after subtotal gastrectomy. Delayed respiratory depression occured 7 hrs after transfer to admission room. She was intubated and had ventilatory care. The fluid from the epidural catheter was examined and the result showed that gucose was 107 mg% and protein was 31 mg%. Immediate naloxone administration and ventilatory care for one day was done. The patient discharged without any sequalae.