The present invention relates to a photoresist stripper composition, a method of stripping a photoresist by using the photoresist stripper composition, and a method of producing a liquid crystal display device or a semiconductor device. During a lift-off process as well as a known process of stripping the photoresist, the photoresist stripper composition is capable of completely stripping a photoresist film denatured due to an excessive photolithography process at low temperatures within a short period, does not damage a conductive film or an insulating film at a lower part of the photoresist even if rinsing is performed by only using water and not isopropanol, which is an intermediate rinsing solution, and has an excellent corrosion inhibiting ability to the conductive metal film or the insulating film at the lower part of the photoresist.