PROBLEM TO BE SOLVED: To provide an absorbent article capable of suitably diffusing a liquid in a plane direction of an absorbent body when absorbing the liquid, and water-absorbent resin particles and the absorbent body which give the absorbent article. An absorbent article 100 includes an absorbent body 10, the absorbent body 10 contains water-absorbent resin particles 10a, and the water-absorbent resin particles 10a are measured by the following procedures (1) to (6). The swelling height is 10 mm or less. (1) A container having a recess having a bottom area of 50 cm 2 is arranged with the recess being opened in the vertical direction. (2) 1.00 g of water-absorbent resin particles are placed in the recess. (3) A nonwoven fabric is arranged on the water absorbent resin particles in the recess. (4) A weight having a mass of 90 g is arranged on the non-woven fabric. (5) Supplying saline into the recess. (6) The vertical moving distance of the weight when 300 seconds have elapsed from the start of swelling of the water-absorbent resin particles is measured as the swelling height. [Selection diagram] Figure 1【課題】吸液した際に吸収体の平面方向に液が好適に拡散し得る吸収性物品、並びに、当該吸収性物品を与える吸水性樹脂粒子及び吸収体を提供する。【解決手段】吸収性物品１００は、吸収体１０を備え、吸収体１０は、吸水性樹脂粒子１０ａを含有し、吸水性樹脂粒子１０ａにおいて、下記（１）～（６）の手順により測定される膨潤高さは１０ｍｍ以下である。（１）底面積５０ｃｍ２の凹部を有する容器を前記凹部が鉛直方向に開口した状態で配置する。（２）前記凹部内に吸水性樹脂粒子１．００ｇを配置する。（３）前記凹部内において前記吸水性樹脂粒子上に不織布を配置する。（４）前記不織布上に質量９０ｇの重りを配置する。（５）前記凹部内に生理食塩水を供給する。（６）前記吸水性樹脂粒子の膨潤開始時から３００秒経過したときの前記重りの鉛直方向の移動距離を前記膨潤高さとして測定する。【選択図】図１
