Diffusivity, through providing a water-absorbing agent with improved performance of both the (vertical diffusion absorption in particular) under pressure absorption performance and non-pressure absorption capacity of [challenges] water-absorbent resin, absorption is high and also in diapers The present invention is to provide a low cost water-absorbing agent can provide an absorbent small amount of return liquid is improved. A main component (salt)-based water-absorbent resin of polyacrylic acid is [SOLUTION] surface crosslinking, there is provided a particulate water-absorbing agent including a spacer of at least one selected from the water-insoluble particles and polycations, particulate water absorbency hung under no pressure of the agent (FSC) is a 55~65 [g / g], absorbency against pressure (AAP-4.83kPa) is and is 20~30 [g / g], pressure particulate water-absorbing agent pressure vertical diffusion absorption (VDAUP-4.83kPa) satisfies the 30~80g.【課題】吸水性樹脂の無加圧下吸水倍率と加圧下吸収性能(特に垂直拡散吸収量)の双方の性能を高めた吸水剤を提供し、オムツにおいても吸収量が高く、かつ拡散性、通液性が改善されて戻り量が少ない吸収体を提供することが出来る吸水剤を安価に提供することにある。【解決手段】表面架橋されたポリアクリル酸(塩)系吸水性樹脂を主成分とし、ポリカチオン及び水不溶性微粒子から選ばれる少なくとも1種のスペーサーを含む粒子状吸水剤であって、粒子状吸水剤の無加圧下吊り下げ吸水倍率(FSC)が55~65[g/g]であり、加圧下吸水倍率(AAP-4.83kPa)が20~30[g/g]であり、かつ、加圧下垂直拡散吸収量(VDAUP-4.83kPa)が30~80gを満たす粒子状吸水剤。
