PROBLEM TO BE SOLVED: To provide a pants-type absorbent article in which a seal portion can be easily broken and therefore easily removed from a wearer. A pants-type disposable diaper (1) has an abdominal part and a dorsal part and a lateral end of the abdominal part and a lateral end of the dorsal part that are superposed so that their inner surfaces face each other. And a seal portion 5L to be joined. The seal portion includes a plurality of fusion-bonding portions 11 that fuse the lateral end of the ventral side portion and the lateral end of the dorsal side portion to each other. The fused portions are aligned in the longitudinal direction L while being separated from each other. At least two of the fusion-bonding portions adjacent to each other include a thin-walled portion 11bt having a relatively small thickness and a thick-walled portion 11bT having a relatively large thickness. Each of the thin portions 11bt is located on the inner side Wi in the lateral direction of the fusion-bonded portion 11. [Selection diagram] Fig. 5【課題】シール部を容易に破ることができ、したがって着用者から容易に取り外すことができるパンツ型吸収性物品を提供する。【解決手段】パンツ型使い捨ておむつ１は、腹側部及び背側部と、内面同士が互いに対面するように重ね合わされた腹側部の横方向端部及び背側部の横方向端部を互いに接合するシール部５Ｌと、を備える。シール部は、腹側部の横方向端部及び背側部の横方向端部を互いに融着する複数の融着部１１を含む。融着部は、縦方向Ｌに互いに離間しつつ整列されている。融着部のうち少なくとも互いに隣接する２つの融着部がそれぞれ、相対的に厚さが小さい薄肉部１１ｂｔ及び相対的に厚さが大きい厚肉部１１ｂＴを含む。薄肉部１１ｂｔはいずれも当該融着部１１の横方向内側Ｗｉに位置する。【選択図】図５
