PROBLEM TO BE SOLVED: To provide an underpants type disposable diaper which allows a caregiver to smoothly replace a diaper on a few-month-old baby or several-month-old baby.SOLUTION: A disposal tape 4 having an attachment part 40 which can be detachably attached to a non-skin facing surface is provided on a center part in a lateral direction Y of a non-skin facing surface of an exterior body 3 of a back side part C. An overlapping part with an absorber 23 on a non-skin facing surface of the exterior body 3 on a ventral part A or crotch part B has an aperture formation area 6 on which plural apertures 5 are disposed in a scattered state. On the exterior body 3, if the disposal tape 4 and a virtual extension area of the disposal tape 4 in the vertical direction X are placed on a center of the lateral direction Y, and an area having a lateral direction length which is three times of a lateral direction length of the disposal tape 4 and extension area is an exterior body lateral direction center area 7, the exterior body lateral direction center area 7 has a large area ratio of the apertures 5 relative to an exterior body lateral direction end areas 8 on outside of the lateral direction Y.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2018,JPO&INPIT【課題】低~中月齢児のおむつ交換をスムーズに行うことができるパンツ型使い捨ておむつを提供すること。【解決手段】背側部Cの外装体3の非肌対向面の横方向Yの中央部に、該非肌対向面に着脱自在に止着可能な止着部40を有する廃棄テープ4が設けられている。腹側部A又は股下部Bの外装体3の非肌対向面における吸収体23との重複部分に、複数の開孔5が散在する開孔形成領域6が設けられている。外装体3において、廃棄テープ4及び該廃棄テープ4の縦方向Xへの仮想的な延長領域を横方向Yの中央に置いて該廃棄テープ4及び該延長領域の横方向長さの3倍の横方向長さを有する領域を、外装体横方向中央域7とした場合、該外装体横方向中央域7は、その横方向Yの外方に位置する外装体横方向端部域8に比して、開孔5の面積率が大きい。【選択図】図3
