It includes the water absortion power resin particle as necessity, it offers the water absorption medicine which is suited for the use in the hygienic material. As for the water absorption medicine of this invention, polymerizing acid radical content unsaturated monomer, being the water absorption medicine which includes the water absortion power resin particle which can, centrifuge retention volume (CRC) to be 5 - 20g/g, because it includes with chemical compound and the polyvalent metal salt which possess the constitution unit of poly- alkylene glycol origin other than unsaturated monomer, high physiological brine flow inductivity (SFC) it possesses this centrifuge retention volume (CRC) in the territory.吸水性樹脂粒子を必須として含み、衛生材料における用途に適した吸水剤を提供する。本発明の吸水剤は、酸基含有不飽和モノマーを重合して得られる吸水性樹脂粒子を含む吸水剤であって、遠心分離機保持容量(CRC)が5~20g/gであり、不飽和モノマー以外のポリアルキレングリコール由来の構成単位を有する化合物と、多価金属塩とを含んでいるので、かかる遠心分離機保持容量(CRC)の領域において高い生理食塩水流れ誘導性(SFC)を有する。
