A disposable diaper in the present invention is configured in such a manner that a section corresponding to a first portion at the longitudinal intermediate of the inner elastic members is designated as an unfixed section where a back sheet and an outer sheet are not fixed a section corresponding to a second portion on the both longitudinal sides of the unfixed section is designated as a fixed section, where the back sheet and the outer sheet are fixed the unfixed section with the inner elastic members is not fixed to the back sheet or the outer sheet, or is fixed only to the outer sheet and the fixed section with the inner elastic members is fixed to the back sheet and the outer sheet.
