An image inspection device according to the present invention uses inspection region definition information including: information for defining an initial outline of an inspection region; and another information for defining which part of the outline of the inspection region should be searched as a search range with reference to the initial outline. An outline of the inspection region is then generated in such a way that: a plurality of base points are set on the initial outline; in a region inside the search range, an edge searching process is performed on a line segment passing through each of the base points and intersecting to the initial outline, thereby determining an edge point corresponding to each of the base points; and the obtained edge points are connected to each other or approximated.