A sheet with anti-counterfeit functions for making counterfeiting highly
difficult in the case where authentication information is recorded using
the properties of cholesteric liquid crystal is provided. A cholesteric
liquid crystal layer 110 having a selective reflected wavelength band in
at least the visible light region is provided in such a manner that this
cholesteric liquid crystal layer 110 is a single layer of which thickness
is approximately uniform, and an authentication region 112 of which
selective reflected wavelength band is different is provided in at least
one place. Preferably, an adhesive layer 130 is provided on one side of
the cholesteric liquid crystal layer 110. Preferably, a base 120 is
provided between the cholesteric liquid crystal layer 110 and the
adhesive layer 130. Preferably, a light absorbing layer 140 is provided
on adhesive layer 130 of the cholesteric liquid crystal layer 110.