An absorbent article comprising at least an absorber and a composite sheet • the composite sheet comprising an elastic nonwoven fabric in an elongated state bonded to a non-elastic sheet, wherein • the elastic nonwoven fabric being a mixture of polypropylene fibers with polyurethane fibers at a ratio of 45:55 with a basis weight of 35 g/m 2, and • after gear elongation via a filler roll in the manufacturing flow direction to be 2.3 times larger than normal size, being • hot-melt adhered to said non-elastic sheet in the form of a polypropylene spunlaid nonwoven fabric having a basis weight of 19 g/m 2 to thereby obtain the composite sheet, • at least one surface of the composite sheet has a contact area ratio of at least 65% at a time of 135% elongation and at a time of 170% elongation, • wherein the contact area ratio is an area percentage of a water-based paint transferred to a filter paper after being applied onto one surface of the composite sheet in the elongated state, with the filter paper superimposing the water-based paint being retained thereon for 10 seconds under 250g of weight, whereas this contact area ratio is measured in accordance with the test method disclosed in the description, and • the composite sheet has an airflow resistance value of no greater than 0.20 KPa.s/m at a time of 150% elongation, whereas the airflow resistance is measured in accordance with the test method disclosed in the description, • wherein the composite is mounted on a skin-abutting surface of the absorbent article when worn by a wearer and wherein • the elastic nonwoven fabric is disposed to face a skin of a wearer, • wherein the elastic nonwoven fabric has a plurality of strip-shaped low-density regions and a plurality of strip-shaped high-density regions that are alternately and continuously formed on both sides thereof, with the strip-shaped high-density regions on one surface and the strip-shaped high-density regions on she other surface being alternately formed, • wherein the non-elastic sheet is bonded to the elastic nonwoven fabric via an adhesive agent, and • wherein the adhesive agent is coated onto the non-elastic sheet to form a coated pattern via spiral coating, • and the hot-melt adhesive agent has a basis weight of 2g/m 2. • the composite sheet comprising an elastic nonwoven fabric in an elongated state bonded to a non-elastic sheet, wherein • the elastic nonwoven fabric being a mixture of polypropylene fibers with polyurethane fibers at a ratio of 45:55 with a basis weight of 35 g/m 2, and • after gear elongation via a filler roll in the manufacturing flow direction to be 2.3 times larger than normal size, being • hot-melt adhered to said non-elastic sheet in the form of a polypropylene spunlaid nonwoven fabric having a basis weight of 19 g/m 2 to thereby obtain the composite sheet, • at least one surface of the composite sheet has a contact area ratio of at least 65% at a time of 135% elongation and at a time of 170% elongation, • wherein the contact area ratio is an area percentage of a water-based paint transferred to a filter paper after being applied onto one surface of the composite sheet in the elongated state, with the filter paper superimposing the water-based paint being retained thereon for 10 seconds under 250g of weight, whereas this contact area ratio is measured in accordance with the test method disclosed in the description, and • the composite sheet has an airflow resistance value of no greater than 0.20 KPa.s/m at a time of 150% elongation, whereas the airflow resistance is measured in accordance with the test method disclosed in the description, • wherein the composite is mounted on a skin-abutting surface of the absorbent article when worn by a wearer and wherein • the elastic nonwoven fabric is disposed to face a skin of a wearer, • wherein the elastic nonwoven fabric has a plurality of strip-shaped low-density regions and a plurality of strip-shaped high-density regions that are alternately and continuously formed on both sides thereof, with the strip-shaped high-density regions on one surface and the strip-shaped high-density regions on she other surface being alternately formed, • wherein the non-elastic sheet is bonded to the elastic nonwoven fabric via an adhesive agent, and • wherein the adhesive agent is coated onto the non-elastic sheet to form a coated pattern via spiral coating, • and the hot-melt adhesive agent has a basis weight of 2g/m 2.