PROBLEM TO BE SOLVED: To provide a disposable diaper having a fastening tape which is disposed along a body and easily keeps the engagement state.SOLUTION: A fastening tape 90 of a disposable diaper 10 includes a base material sheet 91 and a hook sheet 92 fixed on the base material sheet and has a plurality of joining parts 94a where the base material sheet and the hook sheet are joined and a plurality of non-joining parts 94b where the base material sheet and the hook sheet are not joined. The joining parts and the non-joining parts extend in a product longitudinal direction and are disposed alternately in a product width direction.