There is provided an absorbent article that improves a curvature property, improves air permeability, and improves touch. A diaper of the device includes a topsheet, a backsheet, and an absorbent member oblong in a longitudinal direction disposed between both the sheets. A skin-facing surface of the topsheet has undulation and a non-skin-facing surface of the topsheet is flat. The absorbent member includes an absorbent core and a covering member wrapping the absorbent core. The absorbent core includes high-basis weight portions and low-basis weight portions adjacent to the high-basis weight portions, and the high-basis weight portions and the low-basis weight portions are integrally formed. A skin-facing surface of the absorbent core is flat, and a non-skin-facing surface of the absorbent core has an uneven structure. The coating area ratio of a skin-side absorbent core adhesive, which fixes a skin-side covering member to the skin-facing surface of the absorbent core, is lower than the coating area ratio of a non-skin-side absorbent core adhesive that fixes a non-skin-side covering member to the non-skin-facing surface of the absorbent core.本創作之尿布(1)包含正面片材(2)、背面片材(3)、及配置於該等兩片材(2、3)間之縱長之吸收體(4)。正面片材(2)係其肌膚對向面側為具有起伏之構造,且非肌膚對向面側平坦。吸收體(4)包含吸收性芯體(41)及包裹其之被覆材(42)。吸收性芯體(41)包含高基重部(43)及與其鄰接之低基重部(44),高基重部(43)及低基重部(44)係一體成形。吸收性芯體(41)之肌膚對向面側平坦,且非肌膚對向面側為凹凸構造。將肌膚側被覆材(421)與吸收性芯體(41)之肌膚對向面(41T)固定之肌膚側吸收性芯體接著劑(51T)之塗敷面積率,低於將非肌膚側被覆材(422)與吸收性芯體(41)之非肌膚對向面(41U)固定之非肌膚側吸收性芯體接著劑(51U)之塗敷面積率。1‧‧‧拋棄式尿布2‧‧‧正面片材3‧‧‧背面片材4‧‧‧吸收體7‧‧‧緊固帶8‧‧‧著扣帶9‧‧‧空間9X‧‧‧空間9Y‧‧‧空間21‧‧‧隆起部22‧‧‧凹陷部25‧‧‧接合部41‧‧‧吸收性芯體42‧‧‧被覆材43‧‧‧高基重部44‧‧‧低基重部44X‧‧‧低基重部44Y‧‧‧低基重部61‧‧‧立起褶皺形成用之彈性構件62‧‧‧立起褶皺形成用片材63‧‧‧腿彈性構件64‧‧‧腰部彈性構件411‧‧‧塊狀形狀區域412‧‧‧外周區域A‧‧‧腹側部B‧‧‧背側部C‧‧‧下襠部CL‧‧‧中心線L4‧‧‧寬度L5‧‧‧寬度L6‧‧‧長度L7‧‧‧長度X‧‧‧方向Y‧‧‧方向
