PROBLEM TO BE SOLVED: To provide a method for highly accurately evaluating the degree of liquid leakage from an absorbent article when water-absorbent resin particles are used in the absorbent article, and liquid leakage from the absorbent article. To provide water-absorbent resin particles that can effectively contribute to the suppression of the generation of water. SOLUTION: A water-absorbing layer 5 made of water-absorbent resin particles is arranged along an inclined surface S1 inclined with respect to a horizontal plane S0, and a droplet-shaped test liquid 50 containing water is injected into the water-absorbing layer 5. And measuring the diffusion distance D, which is the distance that the test liquid 51 injected into the water absorbing layer 5 diffuses along the inclined surface S1 within a predetermined time, in this order, and includes the horizontal plane S0 and the inclined surface. Disclosed is a method for evaluating the liquid leakage property of water-absorbent resin particles having an inclination angle θ formed by S1 of 40 degrees or less. [Selection diagram] Figure 1【課題】吸水性樹脂粒子が吸収性物品に用いられたときの吸収性物品からの液体漏れの発生の程度を、高い精度で評価する方法を提供すること、及び、吸収性物品からの液体漏れの発生を抑制することに効果的に寄与できる、吸水性樹脂粒子を提供すること。【解決手段】吸水性樹脂粒子からなる吸水層５を、水平面Ｓ０に対して傾斜した傾斜面Ｓ１に沿って配置することと、吸水層５に水を含有する液滴状の試験液５０を注入することと、吸水層５に注入された試験液５１が所定の時間内に傾斜面Ｓ１に沿って拡散した距離である拡散距離Ｄを測定することと、をこの順に含み、水平面Ｓ０と傾斜面Ｓ１とがなす傾斜角θが４０度以下である、吸水性樹脂粒子の液体漏れ性を評価する方法が開示される。【選択図】図１
