A poly(methyl methacrylate) (PMMA) film with moth-eye-structured surface was coated with PtCl-modified TiO2 (PtCl-TiO2) particles to form an antireflective and self-cleaning film that works under visible-light illumination. Coating PtCl-TiO2 on the PMMA surface produced a porous PtCl-TiO2 layer. Transmittance spectra showed near independency of the tilted angle of light illumination for the coated film. The coated film showed the ability to decompose oleic acid under visible-light irradiation.