A water-absorbent sheet structure comprises a structure in which an absorbent layer comprising a water-absorbent resin and an adhesive is sandwiched with nonwoven fabrics from an upper side and a lower side of the absorbent layer, wherein the water-absorbent resin is contained in an amount of from 100 to 1,000 g/m 2 , and wherein a mass-average particle size of the water-absorbent resin is from 50 to 800 µm, and wherein a particle size rate index of the water-absorbent resin is 0.12 s/µm or less, and wherein the water-absorbent sheet structure has a peeling strength of from 0.05 to 3.0 N/7 cm. The water-absorbent sheet structure according to the present invention exhibits some effects that a water-absorbent sheet structure has excellent shape retaining ability even when the structure is thin, so that the water-absorbent sheet structure does not undergo deformation of the form before liquid absorption or after the absorption, and is capable of sufficiently exhibiting absorbent properties such as liquid permeability, a small amount of liquid re-wet, and a small liquid slope leakage.本發明係一種吸水片材結構體，其係具有含有吸水性樹脂及接著劑而成之吸收層藉由不織布自該吸收層之上方及下方夾持之構造者，該吸水性樹脂之含量為100~1000 g/m2，該吸水性樹脂之質量平均粒徑為50~800 μm，且該吸水性樹脂之粒徑速度指數為0.12秒/μm以下，吸水片材結構體之剝離強度為0.05~3.0 N/7 cm。本發明之吸水片材結構體即便為薄型，因形態保持性良好，故發揮如下之優異效果：於液體吸收前或吸收後不會引起變形，且可充分地發揮液體透過性、較少之液體逆流量、傾斜時之較少之漏液等吸收能力。
