PROBLEM TO BE SOLVED: To provide an absorbent article which can suppress movement of menstrual blood beyond a leakage prevention groove, and which can maintain preferable leakage prevention performance, even when peeling between a surface sheet and an absorber occurs on a leakage prevention groove.SOLUTION: An absorbent article 1 for absorbing menstrual blood comprises: a liquid permeable surface sheet 2 for forming a skin facing surface a rear surface sheet 3 for forming a non-skin facing surface and an absorber 4 arranged between both sheets, and has a vertical direction X along a cross direction of a wearer and a lateral direction Y orthogonal to the vertical direction. A side leakage prevention groove 81 in which the surface sheet 2 is invaginated into the absorber 4, extends on each of both sides along the vertical direction X, on the skin facing surface. A hemagglutination agent is included in a lower member 42a arranged on a position closer to the rear surface sheet 3 than the surface sheet 2, and there is a part where, a range 9 in which the hemagglutination agent is arranged on the lower member 42a, and parts 81, 81 extending in at least the vertical direction of the leakage prevention groove 8 are overlapped.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2018,JPO&INPIT【課題】防漏溝に表面シートと吸収体との間の剥離が生じた場合であっても、防漏溝を超えての経血の移動が抑制され、良好な防漏性能が維持される吸収性物品を提供すること。【解決手段】肌対向面を形成する液透過性の表面シート2、非肌対向面を形成する裏面シート3及びこれら両シート間に配されている吸収体4を備え、着用者の前後方向に沿う縦方向X及びそれに直交する横方向Yを有する経血吸収用の吸収性物品1であり、記肌対向面には、表面シート2が吸収体4に陥入した側方防漏溝81が、縦方向Xに沿った両側に、それぞれ連続して延びており、表面シート2よりも裏面シート3に近い位置に配された下方部材42aに血球凝集剤が含まれており、下方部材42aにおける血球凝集剤が配されている範囲9と、防漏溝8の少なくとも縦方向に延びる部分81,81とが重なっている部分を有する。【選択図】図3