The present invention provides a liquid crystal display device in which a decrease in the voltage holding ratio (VHR) of a liquid crystal layer and an increase in the ion density (ID) are prevented and problems of display defects such as white streaks, alignment unevenness, and image sticking are overcome. The liquid crystal display device of the present invention in which a decrease in the voltage holding ratio (VHR) of a liquid crystal layer and an increase in the ion density (ID) are prevented and problems of display defects such as image sticking are overcome is particularly useful for active matrix driving liquid crystal display devices with an IPS mode and an FFS mode and can be applied to liquid crystal display devices of liquid crystal televisions, monitors, cellular phones, and smart phones.