A disposable diaper enabling the male sex organ to be drawn out easily at the time of urination, which includes: a chassis having at least a front body and a rear body when wearing; a liquid permeable top sheet arranged in at least part of the chassis; a liquid impermeable back sheet on one side in the thickness direction of the top sheet; and a liquid retentive absorber between the top sheet and the back sheet. The chassis has a first chassis and a second chassis. The front body of the chassis has an overlapping section formed by overlapping in at least part of the first and second chassis. The overlapping section has connecting sections for connecting the first and second chassis separated across a substantially center line, which extends in the longitudinal direction of the diaper and divides the width direction into two parts, and a non-connecting section between the connecting sections.