A water-absorbent sheet structure comprises a structure in which an absorbent layer containing a water-absorbent resin (A) and a water-absorbent resin (B) is sandwiched with fibrous webs from an upper side and a lower side of the absorbent layer, characterized in that the water-absorbent resin (A) and the water-absorbent resin (B) are contained in a total amount of from 100 to 1,000 g/m 2 , and that the water-absorbent resin (A) and the water-absorbent resin (B) have the following properties: (1) the water-absorbent resin (A) having a water-retention capacity of saline solution (Ra) from 15 to 55 g/g； (2) the water-absorbent resin (B) having a water-retention capacity of saline solution (Rb) from 10 to 50 g/g； and (3) Ra and Rb mentioned above satisfies the relationship of the following formula: Ra - Rb ‰¥ 5 (g/g). The water-absorbent sheet structure of 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.本發明係關於一種吸水片材結構體，其特徵在於：其係具有含有吸水性樹脂(A)及吸水性樹脂(B)而成之吸收層藉由纖維狀網自該吸收層之上方及下方夾持之構造者，該吸水性樹脂(A)及該吸水性樹脂(B)之合計含量為100~1000 g/m2，且，該吸水性樹脂(A)及該吸水性樹脂(B)具有以下特性：(1)吸水性樹脂(A)之生理鹽水保水能力(Ra)為15~55 g/g；(2)吸水性樹脂(B)之生理鹽水保水能力(Rb)為10~50 g/g；以及(3)上述Ra與Rb滿足下式：Ra-Rb≧5(g/g)之關係。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，且可充分地發揮吸收能力。
