PROBLEM TO BE SOLVED: To provide a disposable diaper with which a pair of fastening tapes are integrated before use, and which enables a user to easily separate the fastening tapes in use to easily wear the diaper.SOLUTION: A disposable diaper 1 has a fastening tape constitution part 45 disposed extending over both outer ends of a side strap in a state where both outer ends of the side strap are folded. The fastening tape constitution part includes: a plurality of separating parts 46 separating a first fastening tape 41 from a second fastening tape 42 and a plurality of connecting parts 47 connecting the first fastening tape and the second fastening tape between the separating parts and disposed in a linear connection area. The plurality of separating parts are disposed outside of the connection area in the direction orthogonal to the linear direction of the connection area and provided with an inclined part inclined to the linear direction of the connection area.
