A tracing device includes an appropriateness determination section configured to determine whether an image processing, which is executed in a production process of a board product by a board work machine, satisfies an appropriateness condition indicating reliability of a result of the image processing when the result of the image processing stays within a permissible range in which the result of the image processing is determined normal and an information management section configured to record image data used in the image processing as traceability information according to the result of the determination made by the appropriateness condition determination section.