An inspection system 1 is provided with: a learning device 100 that performs learning of a detector for detecting a detection target portion of a tank 2, which is an inspection target; and an inspection device 200 that detects the detection target portion of the tank 2 by using the detector that has undergone the learning by the learning device 100. The learning device 100 is provided with: a learning image acquisition unit that acquires an image taken of the inspection target including the detection target portion; a learning data generation unit that generates learning data from the image of the detection target portion included in the image taken of the inspection target acquired by the learning image acquisition unit; and a learning unit that performs learning of the detector by using the learning data generated by the learning data generation unit. The learning data generation unit divides at least some of a plurality of images of the detection target portion into a plurality of images, and generates learning data from each of the divided images of the detection target portion.
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