Problem to be solved: to provide an absorbent containing an absorbent resin and an absorbent article using the absorption member, which are excellent in water absorption performance and can improve the absorption performance under load when used in an absorbent.Water-soluble ethylene unsaturated monomer, water repellent resin, which is a polymer crosslinking agent of an internal crosslinking agent and a post crosslinking agentHydrophilic fiberIncludingSaid water absorbent resin(a) under the 4.14 kPa load(b) the mass proportion of the particles of 150-850. Mu. M in the entirety of the absorbent resin is 85 mass% or more.AndThe mass percentage of particles of 300 to 400. Mu. M is greater than 20 mass%(c) the tan δ measured by classifying particles of 300 to 400. Mu. M of the absorbent resin was 2.00. Times. 10. Sup. - 2 or less.The absorbent capacity index represented by the following equation (I) isAbsorbent.Elastic capacity of absorption capacity = storage modulus [PA] * centrifugal retention rate [g / g]... (I)Diagram【課題】吸水性能に優れ、吸収体に使用した場合に荷重下での吸収性能を向上させることができる吸水性樹脂を含む吸収体及び該吸収体を用いた吸収性物品を提供する。【解決手段】水溶性エチレン性不飽和単量体と内部架橋剤と後架橋剤との重合体架橋物である吸水性樹脂と、親水性繊維と、を含み、前記吸水性樹脂が、（Ａ）４．１４ｋＰａ荷重下での生理食塩水吸水能が１６ｍＬ／ｇ以上、（Ｂ）前記吸水性樹脂全体に占める１５０～８５０μｍの粒子の質量割合が８５質量％以上であり、且つ、３００～４００μｍの粒子の質量割合が２０質量％以上、（Ｃ）前記吸水性樹脂の３００～４００μｍの粒子を分級して測定したｔａｎδが２．００×１０－２以下、および（Ｄ）下記式（Ｉ）で表される吸収容量弾性指数が６８０００以上である、吸収体。 吸収容量弾性指数＝貯蔵弾性率［Ｐａ］×遠心保持率［ｇ／ｇ］ ・・・（Ｉ）【選択図】図１
