PROBLEM TO BE SOLVED: To provide an absorber in which absorber for sanitary product is improved to make it thinner.SOLUTION: There is provided an absorber 1 comprising an absorption core 4 comprising highly water absorptive polymer particle 2 and water absorptive fiber 3 and sheet member 5 covering the absorption core. The highly water absorptive polymer particle has a water retainment magnification of 37 g/g or more, DW 5 minutes value as absorption volume when the highly water absorptive polymer particle is immersed in physiological saline solution for 5 minutes is 40 ml/g or more, later stage absorption speed calculated with the time at which absorption volume of the highly water absorptive polymer particle reach 40 ml/g to 50 ml/g is 6 ml/g x minutes or more, weak pressurization SFC as liquid diffusion efficiency under weak pressurization is 5×10ml*seconds, repeat absorption force index defined as water retainment magnification x later stage absorption x weak pressurization SFC x 10is two or more.SELECTED DRAWING: Figure 1【課題】衛生用品の吸収体を改良して、薄型化が可能な吸収体の提供。【解決手段】高吸水性ポリマー粒子２と、吸水性繊維３とを含む吸収コア４と、吸収コアを包被するシート部材５とを備える吸収体１であって、高吸水性ポリマー粒子の保水倍率が３７ｇ／ｇ以上、高吸水性ポリマー粒子を生理食塩水に５分間浸漬したときの吸収量であるＤＷ５分値が４０ｍｌ／ｇ以上、高吸水性ポリマー粒子の吸収量が４０ｍｌ／ｇから５０ｍｌ／ｇに到達する時間から算出される後期吸収速度が６ｍｌ／ｇ・分以上、微加圧下の液体拡散性能である微加圧ＳＦＣが５×１０－６・ｍｌ・秒以上、保水倍率×後期吸収速度×微加圧ＳＦＣ×１０３で定義される繰返し吸収力指数が２以上である吸収体。【選択図】図１
