A method of manufacturing an underpants-type absorbent article having an outer body provided with a mutually separate front piece, back piece and connecting sheet, and wherein the front piece and the back piece are mutually joined at side areas and are mutually connected by the connecting sheet extending in the front-to-rear direction at the crotch area, and an inner body containing an absorptive body and which is overlapped and anchored to the connecting sheet on the inside of the outer body, comprises, in turn, transporting a continuous body of the front piece in the form of a front piece web and a continuous body of the back piece in the form of a back piece web in a machine direction while maintaining a spacing area in a cross-machine direction, forming a continuous body of the outer body in the form of an outer body web by attaching the connecting sheet to the front piece web and the back piece web at intervals in the machine direction so as to straddle the spacing area, cutting the outer body web in order to form edges that define leg holes, and attaching the inner body to the outer body web.
