Poisoning due to potassium bromate, cold wave neutralizer for permanent waving solution in hair styling, is rarely encountered and only few cases are as a cause of acute renal failure reported in medical literature. Recently, we saw a 18 year-old-female patient, hair stylist, who was admitted to Severance Hospital due to acute renal failure after accidental ingestion of potassium bromate. This is the first known case of acute renal failure due to potassium bromate poisoning in Korea.