PROBLEM TO BE SOLVED: To provide a water-absorbing resin excellent in water-absorbing performance, capable of improving absorption performance under a load when being used for an absorber； and to provide a water-absorbing article using an absorber including the water-absorbing resin.SOLUTION: A water-absorbing resin 5 is obtained by polymerizing a water-soluble ethylenic unsaturated monomer in the presence of an internal crosslinking agent, and by performing post-crosslinking thereof with a post-crosslinking agent. In the water-absorbing resin, saline water absorption power under a load of 4.14 kPa is 16 mL/g or more, the mass ratio of particles of 150-850 &mu；m occupied in the ratio of the whole water-absorbing resin 5 is 85 mass% or higher, further, the mass ratio of particles of 300-400 &mu；m is 20 mass% or higher, and an absorption capacity elastic index shown by formula (I) is 68,000 or higher: absorption capacity elastic index=storage elastic modulus[Pa]×centrifugal retention[g/g]...(I).SELECTED DRAWING: Figure 1【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吸水性樹脂及びその吸水性樹脂を含む吸収体を用いた吸収性物品の提供。【解決手段】吸水性樹脂５は、水溶性エチレン性不飽和単量体を内部架橋剤の存在下で重合させ、かつ後架橋剤で後架橋することにより得られる吸水性樹脂５であって、４．１４ｋＰａ荷重下での生理食塩水吸水能が１６ｍＬ／ｇ以上であり、かつ当該吸水性樹脂５全体の割合に占める１５０～８５０μｍの粒子の質量割合が８５質量％以上であり、更に３００～４００μｍの粒子の質量割合が２０質量％以上であり、式（Ｉ）で表される吸収容量弾性指数が６８０００以上である吸水性樹脂。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
