PROBLEM TO BE SOLVED: To suppress variations in size and cushioning property of a convex portion projecting to one side in a thickness direction in a belt portion of a pants-type disposable diaper. SOLUTION: This is a pants-type disposable diaper (1), and a belt part (21, 22) has a first non-stretchable sheet (213, 223) and a stretchable nonwoven fabric (215, 225) from one side in the thickness direction. And a stretchable film (31) and a second non-stretchable sheet (214, 224) are laminated, and the stretchable nonwoven fabric (215, 225) and the stretchable film (31) are left and right. The stretchable nonwoven fabrics (215, 225) include stretchable fibers and non-stretchable fibers, and the laminated portion (30) has stretchable nonwoven fabrics (215, 225) stretched in the left-right direction. A plurality of joint portions (40) joined to the first non-stretchable sheets (213, 223) are provided at intervals in the left-right direction. [Selection diagram] Fig. 3【課題】パンツ型使い捨ておむつのベルト部において厚さ方向の一方側に突出する凸部の大きさ及びクッション性のばらつきを抑制すること。【解決手段】パンツ型使い捨ておむつ（１）であって、ベルト部（２１、２２）は厚さ方向の一方側から第１非伸縮性シート（２１３、２２３）と伸縮性不織布（２１５、２２５）と伸縮性フィルム（３１）と第２非伸縮性シート（２１４、２２４）とが積層された積層部（３０）を有し、伸縮性不織布（２１５、２２５）及び伸縮性フィルム（３１）は左右方向に伸縮し、伸縮性不織布（２１５、２２５）は伸縮性繊維と非伸縮性繊維とを含み、積層部（３０）は伸縮性不織布（２１５、２２５）が左右方向に伸長している状態で第１非伸縮性シート（２１３、２２３）に接合されている接合部（４０）を左右方向に間隔をあけて複数有すること。【選択図】図３
