A disposable diaper (1) in which a male sexual organ can be taken out easily at the time of urination. The disposable diaper comprises a chassis (13) having a first chassis (13A) and a second chassis (13B), the first chassis (13A) forming a part of a front body (2), a rear body (3) and a crotch part (4), and the second chassis (13B) forming a part of the front body (2) and arranged at an end located in the longitudinal direction of the first chassis (13A). The front body (2) of the chassis includes an overlapping section (5,5B) formed by overlapping at least part of the first and second chassis with each other, the overlapping section (5,5B) having connecting sections (21) and a non-connecting section (22). The non-connecting section (22) is disposed between the connecting sections (21) and is intended for forming an overlapping opening (5). The overlapping opening is located at a waist region (23) in the front body (2).
