Spunbonded non-woven fabric is made from fiber of a thermoplastic resin and has a predetermined water resistance which has, when the anti-water pressure thereof is measured in a conformity with ISO811, a second anti-water pressure measured for the second time or subsequent to the second time degrading by a predetermined pressure or lower from the first anti-water pressure measured for the first time. The first anti-water pressure is equal to or more than 160 mmH2O and the predetermined pressure is equal to or less than 30 mmH2O.本發明的紡絲黏合不織布係使用熱可塑性樹脂的纖維，且具有當根據ISO811重複測定耐水壓時，第二次之後所測得第二耐水壓相對於第一次所測得第一耐水壓的降低量，在既定壓以下的既定耐水性；而，第一耐水壓係達160mmH2O以上，既定壓在30mmH2O以下。
