A water absorbent sheet suitable for sanitary materials such as paper diapers is provided. The water absorbent sheet according to an aspect of the present invention includes a first base material, a second base material, and a particulate water-absorbing agent sandwiched between the first base material and the second base material； At least one of the base material and the second base material is a water-permeable base material； at least a part of the particulate water-absorbing agent satisfies the following physical properties (1), (2), and (3). (1) Centrifuge retention capacity (CRC) is 30 g / g to 50 g / g (2) Mass average particle diameter (D50) is 200 μm to 600 μm (3) DRC index defined by the following formula (a) is 43 or less DRC index = (49−DRC 5-minute value) / (D50 / 1000) (a)紙オムツ等の衛生材料に適した吸水性シートを提供する。本発明の一態様に係る吸水性シートは、第１基材、第２基材、および上記第１基材と第２基材との間に挟持される粒子状吸水剤を備え；上記第１基材および第２基材の少なくとも一方は、透水性基材であり；上記粒子状吸水剤の少なくとも一部は下記物性（１）、（２）、（３）を満たす。 （１）遠心分離機保持容量（ＣＲＣ）が３０ｇ／ｇ～５０ｇ／ｇ （２）質量平均粒子径（Ｄ５０）が２００μｍ～６００μｍ （３）下記式（ａ）で規定されるＤＲＣ指数が４３以下 ＤＲＣ指数＝（４９－ＤＲＣ５分値）／（Ｄ５０／１０００） ・・・ 式（ａ）
