As a result of a reduction in thickness of an IPS liquid crystal display panel, curl has started to occur in a structure where an optical film such as a polarizer or a retardation film is laminated to the IPS liquid crystal display panel. The present invention is directed to thinning a polarizer which is easily expandable and contractable, and thinning a retardation film located between the polarizer and an IPS liquid crystal display panel to enable the polarizer to come closer to the IPS liquid crystal display panel than ever before to thereby prevent curl of the IPS liquid crystal display panel.