The present invention provides a pull-on disposable diaper having improved air permeability at the waist portion.Dorsal external sheet (12F) and the back side outer sheet (12B) that has been separated but not continuous in the crotch side, to the back surface of the aekbul-permeable sheet of the absorbent body 20 side, the crotch part cover sheet that is exposed on the product (12M) is in the pull-on type disposable diaper laminate, aekbul permeability as the back surface of the sheet number of sheets formed in the side, the number of the intermediate portion (23) B1, and the front outer overlapping part (X) and the back external as the number of the overlapping area (Z) A1 and the front external non-overlapped portion (20F) and the rear when said external non-overlapping area the number of copies of the (20B) C1, B1
