[Problem] To provide a disposable diaper which can be used both as a tape-fastening type and an underpants type with an excellent fit. [Means for Solving Problem] By joining the both side portions of the front body part 12F and back body part 12B respectively to thereby form joined portions 12A on both sides along with a waist opening WO and a pair of right and left leg openings LO and in this diaper, perforated lines 100 are formed on the both side portions of the front body part 12F so as to extend from an edge of the waist opening WO to edges of the leg openings LO and at least one pair of fastening tapes 90 having hook members 92 on inner surfaces thereof and straddle the perforated lines.
