We experimentally demonstrated a retarder with a wide field-of-view as well as a negative dispersion (ND) of birefringence. We stacked reactive mesogen, which has a positive birefringence, and polymethylmethacrylate, which has a negative birefringence. The out-of-plane retardation () of the stacked film was 6 nm. This value is about a tenth of that of a general retarder and demonstrates a small change in the retardation () at an oblique viewing angle. The stacked film showed an ND of the birefringence, where and . The dispersion properties were close to the ideal dispersion of an achromatic retarder and showed a small -dependence on the wavelength of light.