Even with a cholesteric liquid crystal layer adopted, however, in a case where a twist pitch is so large that Morgan's condition (??<<P?????n wherein ?? is a wavelength, P is a twist pitch and ??n is a birefringence difference) is met, that is in a case where no selective reflection wavelength band is shown even if the thickness of a cholesteric liquid crystal layer is about 5 ??m, the rotatory po