To provide an absorbable resin particle that has little variations in absorption performance, particularly water capacity, is excellent in variation coefficient of absorption characteristics under pressure and has a high degree of whiteness excellent in variation coefficient and a low residual monomer amount excellent in variation coefficient and to provide a method for producing the absorbable resin particle.SOLUTION: The absorbable resin particle has the surface of a crosslinked polymer (A) which comprises as essential constitutional units a water-soluble vinyl monomer (a1) and/or a vinyl monomer (a2) which becomes the water-soluble vinyl monomer (a1) by hydrolysis and an internal crosslinking agent (b) subjected to surface crosslinking with a surface crosslinking agent (d). The absorbable resin particle has an average of the water capacity of 30 g/g or more as measured at the number of analysis points N=100 and has a variation coefficient of the water capacity of 3% or less as calculated from an unbiased standard deviation and the average. The method for producing the absorbable resin particle includes a step of drying by irradiating with an electromagnetic wave.SELECTED DRAWING: None【課題】吸収性能、とくに保水量、のバラツキが少なく、さらに加圧下での吸収特性の変動係数に優れ、しかも、高くかつ変動係数に優れた白度及び低くかつ変動係数に優れた残存モノマー量を有する吸収性樹脂粒子、並びにその製造方法を提供する。【解決手段】水溶性ビニルモノマー（ａ１）及び／又は加水分解により水溶性ビニルモノマー（ａ１）となるビニルモノマー（ａ２）並びに内部架橋剤（ｂ）を必須構成単位とする架橋重合体（Ａ）の表面が表面架橋剤（ｄ）で表面架橋された吸収性樹脂粒子であって、分析点数Ｎ＝１００で測定した保水量の平均が３０ｇ／ｇ以上であり、不偏標準偏差と平均から求めたその変動係数が３％以下である吸収性樹脂粒子、並びに、電磁波を照射することにより乾燥する工程を含む該吸収性樹脂粒子の製造方法。【選択図】なし
