1. A failure detection system used in a manufacturing line of an absorbent article having a plurality of steps for a conveyed continuous web, the system comprising: an image processing unit for acquiring a morphological image illustrating a morphology of the absorbent article after processing of the absorbent article, in each of the said steps; a failure detection unit configured to detect the existence of a failure location of the absorbent article after processing, based on the mor-phological image acquired by the image processing unit; and an image display unit configured to display an image of the absorbent article after processing, when a failure location of the absorbent article is detected by the failure detection unit.