The subject invention produces a water-absorbent resin by carrying out stationary polymerization of an ethylenically-unsaturated monomer containing acrylic acid and/or acrylate； cutting the resulting hydrous gelatinous polymer； and drying the hydrous gelatinous polymer which mainly contains angular particles having 6 smooth planes. The resulting water-absorbent resin particles are not aggregate, and can be efficiently dried. By coating at least a part of the surface of each of the particles with an adhesion block agent before, after, and/or at the time of cutting process, the adhesion preventing effect further increases.藉由將含有丙烯酸及/或丙烯酸鹽之烯性不飽和單體靜置聚合，並將聚合後之含水凝膠狀聚合物切斷所得到之形狀為角狀，表面由平滑面構成之主要為六面體之含水凝膠狀聚合物乾燥，可得到為非凝膠狀且可平順地乾燥之吸水性樹脂。藉由於切斷含水凝膠狀聚合物之前、切斷同時及/或切斷之後，將含水凝膠狀聚合物之表面之至少一部分用附著性防止劑塗覆，可以提高吸水性樹脂之非凝集性。
