PROBLEM TO BE SOLVED: To improve the accuracy of inspecting an inspection target. An inspection system 1 uses a learning device 100 for learning a detector for detecting a detection target portion of a tank 2 to be inspected, and a detector learned by the learning device 100 to provide a tank 2. It is provided with an inspection device 200 for detecting a detection target portion. The learning device 100 receives learning data from a learning image acquisition unit that acquires an image of an inspection target including a detection target part and an image of the detection target part included in the image of the inspection target acquired by the learning image acquisition unit. It is provided with a learning data generation unit that generates a learning data unit and a learning unit that learns a detector using the learning data generated by the learning data generation unit. The learning data generation unit divides at least a part of the images of the plurality of detection target parts into a plurality of images, and generates learning data from each of the divided images of the detection target parts. [Selection diagram] Fig. 1
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