UNDERPANTS-TYPE ABSORBENT ARTICLE

A non-expanding/contracting sheet (213) and an expanding/contracting sheet (215) are welded in a front/rear direction by a plurality of weld sections (25), and in an expanded condition, and have a low area ratio region (X) where the proportion of the area of the weld sections per unit area is a prescribed value, and a high area ratio region (Y) where the proportion of the area of the weld sections per unit area is greater than that of the low area ratio region. Within one torso-surrounding section, when a region where the low area ratio region (X) and an absorbent core (11) do not overlap is treated as a first region (F1), a region where the low area ratio region and the absorbent core overlap is treated as a second region (F2), and a region where the high area ratio region (Y) and the absorbent core overlap is treated as a third region (F3), in a left/right direction center section, the second region (F2) is provided between the first region (F1) and the third region (F3) in an up/down direction. 非伸缩性片(213)和