To prevent collapsing of holes and creasing of both side parts when a perforated nonwoven fabric is used as a cover nonwoven fabric, in a two-part exterior shell-type pants-type disposable diaper. The abovementioned problem is solved by having a cover nonwoven fabric (13) that covers the rear surface of an inner layer (200) and extends from between the front-side outer shell (12F) and the inner layer (200) to between the rear-side outer shell (12B) and the inner layer (200), the cover nonwoven fabric (13) extends at least from the rear side of the base edge of one side gather (60) to the rear side of the base edge of the other side gather (60), the cover nonwoven fabric (13) being provided with a large number of front-rear through-holes (14) with intervals therebetween, from between the outer shell (12F) and the inner layer (200) to between the rear-side outer shell (12B) and inner layer (200), and the side edge of the cover nonwoven fabric (13) being positioned at the same position as or further to the center in the width direction than the side edge of the narrowest part of the absorbent (56).本發明所要解決的問題在於提供一種短褲型拋棄式尿布，針對外裝二分割型的短褲型拋棄式尿布，防止當將開孔不織布用於遮罩不織布時在兩側部產生的褶皺或孔的壓潰。 為了解決此問題，本發明的短褲型拋棄式尿布，具有遮罩不織布13，該遮罩不織布13自前側外裝體12F與內裝體200之間一直至後側外裝體12B與內裝體200之間覆蓋內裝體200的背面，遮罩不織布13至少自一方的側部皺褶60的基端部的背面側延伸至另一方的側部皺褶60的基端部的背面側，且在遮罩不織布13上，自前側外裝體12F與內裝體200之間一直至後側外裝體12B與內裝體200之間，隔開間隔地設置有多數個貫通表面和背面之孔14，並且，遮罩不織布13的側緣，位於與吸收體56的寬度最狹窄的部分的側緣相同的位置、或是位於比該吸收體56的寬度最狹窄的部分的側緣更靠近寬度方向中央側的位置。
