A manufacturing method of an underpants-type absorbent article, which is provided with: 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 (1 C), 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, comprising, in turn: a transport step for 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 perpendicular to the machine direction, an outer body web forming step for 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, an edge forming step for cutting the outer body web in order to form edges that define leg holes, and an attachment step for attaching the inner body to the outer body web, wherein the front sheet web and the back sheet web are respectively provided with a mutually overlapping top sheet web and a back sheet web, and in the outer body web forming step, the areas around both ends of the connecting sheet in a longitudinal direction are respectively sandwiched between the top sheet web and back sheet web of the front piece web and between the top sheet web and back sheet web of the back piece web. 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 (1 C), 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, comprising, in turn: a transport step for 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 perpendicular to the machine direction, an outer body web forming step for 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, an edge forming step for cutting the outer body web in order to form edges that define leg holes, and an attachment step for attaching the inner body to the outer body web, wherein a transport step for 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 perpendicular to the machine direction, an outer body web forming step for 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, an edge forming step for cutting the outer body web in order to form edges that define leg holes, and an attachment step for attaching the inner body to the outer body web, wherein the front sheet web and the back sheet web are respectively provided with a mutually overlapping top sheet web and a back sheet web, and in the outer body web forming step, the areas around both ends of the connecting sheet in a longitudinal direction are respectively sandwiched between the top sheet web and back sheet web of the front piece web and between the top sheet web and back sheet web of the back piece web.