Provided is an epitaxial wafer reverse surface inspecting method capable of detecting a pin mark defect on a reverse surface of an epitaxial wafer, and capable of quantitatively evaluating a defect size of each point-like defect in the pin mark defect. This epitaxial wafer reverse surface inspecting method includes: an imaging step S10 of continuously capturing partial images of an epitaxial wafer reverse surface while causing an optical system to scan by means of a scanning unit; an acquiring step S20 of acquiring an overall image of the reverse surface from the partial images; a detecting step S30 of detecting, from the overall image, a pin mark defect comprising a group formed by a plurality of point-like defects existing on the reverse surface; and a quantifying process step S40 of subjecting each point-like defect in the detected pin mark defect to a quantifying process to calculate a defect area of each point-like defect.
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