Abstract: An inspection device includes an imager and a processor. The imager acquires first image data and second image data. The first image data is of a first weld zone imaged using a first condition. The first weld zone includes a first non-weld area, a second non-weld area, and a first weld area between the first non-weld area and the second non-weld area. The second image data is of the first weld zone imaged using a second condition. The processor performs a first inspection. The first inspection is based on a result of detecting a first boundary and a result of detecting a second boundary. The first boundary is between the first non-weld area and the first weld area based on the first image data. The second boundary is between the first weld area and the second non-weld area based on the second image data.