To provide a disposable diaper that is excellent in terms of absorbable amount and absorption rate. The abovementioned problem is addressed using a pad type disposable diaper 200 characterized in that: a top sheet 22 comprises a thermoplastic nonwoven fabric； absorbent bodies 23A, 23B comprise a lower layer absorbent body 23B, and an upper layer absorbent body 23A provided on the front side thereof； a slit 40 having a prescribed width extends in the front-back direction at least to the upper layer absorbent body 23A at a crotch part C2； the slit 40 having a prescribed width is not provided to the lower layer absorbent body 23B； the top sheet 22 has a sagging part 30 that sags into the slit 40； and a large number of low-transmittance parts 80, in which fibers are fused to each other in a state compressed in the thickness direction, are provided with spacing at least at the sagging part 30.本發明所要解決的問題在於提供一種拋棄式尿布，其可吸收量和吸收速度都優異。 為了解決此問題，本發明的襯墊型拋棄式尿布200，其特徵在於：頂片22是由熱可塑性不織布所構成；吸收體23A、23B，其由下層吸收體23B、及設置在該下層吸收體23B的表面側之上層吸收體23A所構成；至少在胯間部C2中的上層吸收體23A上設置有往前後方向延伸的規定寬度的狹縫40，且在下層吸收體23B上沒有設置規定寬度的狹縫40；頂片22，其具有下陷至狹縫40內之下陷部分30；並且，至少在下陷部分30中，以隔開間隔的方式設置有多數個低透過部80，該低透過部80是在厚度方向被壓縮的狀態下使纖維互相熔接而成。
