Patent ID: 8902417

Claim:
An inspection apparatus for inspecting a defect present on a substrate, the apparatus comprising: a mounting unit on which the substrate is to be mounted; an irradiating unit that irradiates the substrate with light; a detection unit that collects the light from the substrate and forms an image; and a processing unit that detects the defect from a detection result produced by the detection unit, wherein the detection unit includes: a detector that detects the formed image; a background-scattered light removing element configured to remove the light that is background-scattered from the substrate; and a lens with an optical Fourier transform function disposed between the substrate and the background-scattered light removing element, wherein the background-scattered light removing element removes the background-scattered light according to a type of the defect to be detected and a surface state of the substrate, and the background-scattered light removing element is disposed on a Fourier transform plane formed by the lens.