A disposable diaper (1) of the present invention uses a pigmented nonwoven fabric sheet as a constituent sheet constituting an exterior body (5). Side seal parts (S) each have a continuously-linear fusion part (70) extending longitudinally and do not project outward from the diaper (1) during use. A pigment of the pigmented nonwoven fabric sheet constituting the exterior body (5) is condensed in the fusion part (70). The color of the fusion part (70) is similar to the ground color of the front part (F) and the rear part (R), and is deeper than said ground color.本發明之拋棄式尿布(1)係使用對構成外裝體(5)之構成片材著色而成之不織布片材。各側封部(S)具有於縱方向延伸之連續線狀之熔合部(70)，於穿著時不向尿布(1)之外側突出。於熔合部(70)中，構成外裝體(5)之經著色之不織布片材之色素冷凝。熔合部(70)之顏色與前身片(F)及後身片(R)之底色為同色系且較該底色更深。
