PROBLEM TO BE SOLVED: To provide a disposable diaper which can secure flexibility of the entire disposable diaper while preventing a fastening tape from being inadvertently peeled from a target part.SOLUTION: A fastening tape 90 provided to a disposable diaper includes a base material sheet 91 extending from a side flap 70, and a hook sheet 92 with a plurality of engagement hooks provided on a part of a skin contact surface of the base material sheet 91. The hook sheet 92 is provided to extend to an outer end of the base material sheet 91 in a product width direction, and a KES flexural rigidity value per a unit length in the product width direction of the fastening tape in a hook sheet existing region Swhere the hook sheet 92 exists is 1.63 gf/cm/cm or less.
