PROBLEM TO BE SOLVED: To provide an underpants type absorbent article having a soft quality around legs, and good touch feeling, the underpants type absorbent article is formed by fastening an absorption member to an external body using a flexible sheet.SOLUTION: An underpants type absorbent article comprises: a ventral external body arranged on a ventral area； and a back side external body arranged on a back side area, at least. At least one of the ventral external body and the back side external body comprises: an external body comprising a first flexible sheet having a flexible film and a nonwoven sheet laminated on the flexible film； an absorption member having an absorber, and fastened to the external body； and second flexible sheets arranged along at least parts of leg opening parts.SELECTED DRAWING: Figure 1
