To clean a color filter after cutting processing in a good yield without damaging the film surface thereof to remove cullet.

The pressing quantity, pressing pressure and number of rotations of a roll brush 13b being in contact with the rear surface of the transparent substrate 11 of a color filter 10 are made larger than those of the roll brush 13a coming into contact with the surface of the color layer 12 of the color filter 10 and, as the roll brush 13b, a brush comprising a hard material and having a thick bristle diameter, a brush having short bristles or a brush high in bristle density is used.