Pull-on disposable diaper

A pull-on disposable diaper including a lengthwise direction and a lateral direction orthogonal to each other, the pull-on disposable diaper comprising:

• a front side portion;
• a back side portion;
• a crotch portion;
• a waist opening;
• and
• a pair of leg openings,
• an edge portion of the waist opening of the front side portion including a recessed portion that is recessed in the lengthwise direction toward the crotch portion with respect to an edge portion of the waist opening of the back side portion,
• a tape member being fixed on a non-skin side surface of the back side portion so as to be extendable toward the waist opening in the lengthwise direction, the tape member being used for fixing the diaper in a small state in the lengthwise direction when the diaper is disposed of,
• the recessed portion being provided at a position corresponding to the tape member in the lateral direction.