1. A land appearance inspection device, comprising: binarizing means, whereby an input image read by scanning a measurement object pattern with a photoelectric conversion scanner is converted into a binarized image; land circle calculating means for calculating a land circle which approximates a land shape from the binarized image converted by said binarizing means; and land circle accuracy enhancing means for calculating a land circle which minimizes an error of the land circle calculated by said land circle calculating means; wherein land coordinates of an amorphous land with a protrusion portion are detected with high accuracy, based on the land circle calculated by said land circle accuracy enhancing means.