PROBLEM TO BE SOLVED: To efficiently and accurately evaluate visibility of a transparent base material.SOLUTION: A visibility evaluation device 10 comprises: photographing means 11 that photographs a mark 16 existing beneath a transparent base material 17 over the transparent base material 17; observation point-brightness graph preparation means that measures brightness for each observation point along a direction orthogonal to an extension direction of the observed mark 16 for an image captured by photographing, and prepares an observation point-brightness graph; and visibility evaluation means that evaluates visibility of a transparent base material 15 by a brightness curve produced from an end part of the mark 16 over to a part thereof where the mark 16 does not exist in the observation point-brightness graph. The visibility evaluation means evaluates the visibility, using a difference &Dgr;B(&Dgr;B=Bt-Bb) between a top average value Bt of the brightness curve produced from the end part of the mark to the
