A fastening tape (100) provided to this disposable diaper (10) has a substrate sheet (120) and a hook sheet (110) that is affixed to the substrate sheet (120) and to which a plurality of engagement hooks (111) are provided. The engagement force of the fastening tape (100) is 0.3-1.5 N/30 mm inclusive. The bending rigidity value of the fastening tape (100) in the direction (AR2) of approach of the surface of the substrate sheet (120) is lower than the bending rigidity value of the fastening tape (100) in the direction (AR1) of approach of surface of the the hook sheet (110).