PROBLEM TO BE SOLVED: To provide a disposable diaper which can be formed easily and in which the stomach side and buttock side thereof have excellent fitting properties.SOLUTION: The trunks-type disposable diaper 1 includes: an outer cover sheet 2, an absorption body 3, and a liquid impermeable leakage prevention sheet 4 provided between the outer cover sheet 2 and the absorption body 3, and includes a waist opening 8 and a pair of leg-surrounding openings 9. The disposable diaper 1 is characterized in that the rear crotch region has a pleat 7 which is formed either by forming a protrusion section protruding to the clothing side and affixing the side edges of the protrusion section to the outer cover sheet 2, the protrusion section being formed by folding a part of the outer cover sheet 2 in such a manner that the skin surface-side portions of the part of the same face each other, or by forming a protrusion section protruding to the skin surface side and affixing the side edges of the protrusion section to the outer cover sheet 2, the protrusion section being formed by folding a part of the outer cover sheet 2 in such a manner that the clothing-side portions of the part of the same face each other.COPYRIGHT: (C)2013,JPO&INPIT【課題】簡易に形成することができ、お腹側及び臀部側のフィット性に優れる使い捨ておむつを提供すること。【解決手段】外装シート2と、吸収体3と、上記外装シート2と上記吸収体3の間の液不透過性の防漏シート4とを含み、1つの胴回り開口部8及び一対の脚回り開口部9を備える、トランクス形状の使い捨ておむつ1であって、後側股下域が、上記外装シート2の一部を、その肌面側が互いに向かい合うように折り合わせることにより、着衣側に突出する突状部を形成し、そして上記突状部の側縁を上記外装シート2に固定するか、又は上記外装シート2の一部を、その着衣側が互いに向かい合うように折り合わせることにより、肌面側に突出する突状部を形成し、そして上記突状部の側縁を上記外装シート2に固定することにより形成された、ひだ7を有することを特徴とする使い捨ておむつ1。【選択図】図1
