PROBLEM TO BE SOLVED: To provide an underpants type absorbent article for improving wear feeling and fitting property.SOLUTION: An underpants type absorbent article 1 includes: an interior body 20 including a top sheet 21, a back sheet 22, and an absorber 23 between the top sheet 21 and the back sheet 22 and an exterior body 10 positioned on a skin noncontact surface of the interior body 20, and divided into a ventral part 11, a crotch part 13 and a back side part 12. The ventral part 11 and the back side part 12 are constituted of a composite sheet integrated by heat-sealing or ultrasonic adhering a plurality of nonwoven fabrics 14 to an elastic film 15 between the nonwoven fabrics 14. The composite sheet has an elongation load of 0.8 N/50 mm-2.0 N/50 mm when elongated 120% in the extension/contraction direction, and an elongation load of 2.0 N/50 mm-3.5 N/50 mm when elongated 150% in the extension/contraction direction.
