UNDERPANTS TYPE ABSORBENT ARTICLE

To reduce discomfort given to a wearer by difference in followability when worn between an area where a waist part and the absorbent core are not overlapped and an area where the waist part and the absorbent core are overlapped.SOLUTION: A non-stretchable sheet (213) and a stretchable sheet (215) are welded in a back and forth direction by a plurality of welding parts (25), and have in a stretched state a low area rate region (X) where a rate of an area of the welding part per unit area is prescribed value and a high area rate region (Y) where a rate of an area of the welding part per unit is larger than the low area rate region. One of the waist parts, when a region where the low area rate region (X) and an absorbent core do not overlap is a first region (F1) and a region where the low area rate region and the absorbent core (11) overlap is a second region (F2), and a region where the high area rate region (Y) and the absorbent core overlap is a third region (F3), the second region (F2) is provided between the first region (F1) and the third region (F3) in the vertical direction in a central part in the horizontal direction.SELECTED DRAWING: Figure 8 【課題】胴回り部と吸収性コアが重ねられていない領域と、胴回り部と吸収性コアとが重ねられた領域との着用時における追従性の差によって着用者に与える違和感を軽減させる。【解決手段】非伸縮性シート（２１３）と伸縮性シート（２１５）は、複数の溶着部（２５）によって前後方向に溶着されており、伸長状態において、単位面積あたりの溶着部の面積の割合が所定の値である低面積率領域（Ｘ）と、単位面積あたりの溶着部の面積の割合が低面積率領域より大きい高面積率領域（Ｙ）を有し、一方の胴回り部のうち、低面積率領域（Ｘ）と吸収性コアとが重ならない領域を第１領域（Ｆ１）とし、低面積率領域と吸収性コア（１１）とが重なる領域を第２領域（Ｆ２）とし、高面積率領域（Ｙ）と吸収性コアとが重なる領域を第３領域（Ｆ３）とすると、左右方向の中央部において、第２領域（Ｆ２）が、上下方向における第１領域（Ｆ１）と第３領域（Ｆ３）の間に設けられている。【選択図】図８