PROBLEM TO BE SOLVED: To provide a disposable diaper which can take out male genitals easily during urinating.SOLUTION: A disposable diaper 1 is equipped with: a chassis 13 which has at least a front body 2 and a back body 3 a liquid permeable front sheet 11 which is arranged at least at a part of the chassis 13 a liquid impermeable back sheet 14 which is arranged at one side in the thickness direction of the front sheet 11 and a liquid retentive absorber 12 which is arranged between the front sheet 11 and the back sheet 14. An openable part 5 which can separate a predetermined part of the front body 2 along a separation line which connects separate points across a substantial center line which extends in the longitudinal direction of the disposable diaper 1 and divides a width direction into two or an opening which can open the predetermined part of the front body 2 is formed on the front body 2. A reinforcing member which prevents the fracture of both ends is disposed at both ends of the openable part 5 or the opening.COPYRIGHT: (C)2012,JPO&INPIT【課題】排尿時において、男性性器を容易に取り出し可能な使い捨ておむつを提供すること。【解決手段】使い捨ておむつ1は、前身頃2と、後身頃3と、を少なくとも有するシャーシー13と、シャーシー13の少なくとも一部に配設される液透過性の表面シート11と、表面シート11の厚さ方向における一方側に配設される液不透過性の裏面シート14と、表面シート11と裏面シート14との間に配設される液保持性の吸収体12と、を備える。前身頃2には、使い捨ておむつ1の長手方向に延びて幅方向を二分する略中心線を跨いで互いに離間した点のそれぞれを結ぶ切り離し線に沿って前身頃2の所定の部位を切り離し可能な開口可能部5、又は、前身頃2の所定の部位を開口可能な開口部が形成され、開口可能部5又は開口部の両端には、該両端の破断を防止する補強用部材が設けられている。【選択図】図1