The present invention is a novel material that has a high gel strength capable of preventing a decrease in liquid permeation rate by suppressing the gel blocking phenomenon that occurs at the time of water absorption, and that can be suitably used for sanitary materials and the like that simultaneously maintain excellent water retention ability. Water absorbent resin, and an absorbent body and an absorbent article using the same. The water-absorbent resin of the present invention satisfies the following conditions (1) and (2): (1) The physiological saline water retention capacity is 40 g / g or more, and (2) 30 times swelling. The total gel strength represented by the sum of gel strength a, gel strength b at 40-fold swelling, and gel strength c at 50-fold swelling is 5500 Pa or more.本発明は、吸水時に生じるゲルブロッキング現象を抑制して液浸透速度の低下を防ぐことができる高いゲル強度を有し、且つ優れた保水能を同時に保持した、衛生材料等に好適に使用できる新規な吸水性樹脂、並びにそれを用いた吸収体および吸収性物品を提供する。本発明の吸水性樹脂は、下記（１）及び（２）の条件を満足するものである：（１）生理食塩水保水能が４０ｇ／ｇ以上であること、（２）３０倍膨潤時のゲル強度ａ、４０倍膨潤時のゲル強度ｂ、及び５０倍膨潤時のゲル強度ｃの総和で表される総ゲル強度が５５００Ｐａ以上であること。
