Abstract: An inspecting apparatus for a color filter having a plurality of red, green, and blue sub-pixels is disclosed. The inspecting apparatus includes a carrying stage (20, 30) for supporting the color filter, a light source (21, 31) arranged under the carrying stage, a grating (25, 35) arranged over the carrying stage. The grating has a substrate (251, 351) and a plurality of grid lines (252, 352) arranged in the substrate, and an optical inspecting device (24, 34) arranged above the grating and the carrying stage. The cost of the inspecting apparatus is lower than that of a typical inspecting apparatus. An inspecting method for a color filter using the inspecting apparatus is also provided. The inspecting method using the inspecting apparatus is faster than an inspecting method using a typical inspecting apparatus.