PROBLEM TO BE SOLVED: To provide an underpants type absorbent article which has excellent fitting to the back side of a wearer, and is capable of effectively preventing leakage from the back side.SOLUTION: An external wrapping body 3 includes sheet materials 35 and 36 and a plurality of elastic members 33 for external wrapping body formation, which are fixed to the sheet materials 35 and 36, and in an external wrapping body back side area 32, the plurality of elastic members 33 for the external wrapping body formation are disposed at a prescribed interval in a body longitudinal direction X in the state of being extended in a body width direction Y orthogonal to the body longitudinal direction X. In an absorptive core back side area 52 positioned at a back side part B in an absorptive core 5, a linear width direction groove part 6 extending in the body width direction Y is formed, and the elastic members 33 for the external wrapping body formation in the external wrapping body back side area 32 cross the absorptive core back side area 52 in the body width direction Y.COPYRIGHT: (C)2014,JPO&INPIT【課題】着用者の背側に対するフィット性に優れ、背側からの漏れを効果的に防止し得るパンツ型吸収性物品を提供すること。【解決手段】外包体3は、シート材35,36と、該シート材35,36に固定された複数本の外包体形成用弾性部材33とを含んで構成されており、外包体背側領域32において、複数本の外包体形成用弾性部材33が、本体長手方向Xと直交する本体幅方向Yに伸長した状態で、本体長手方向Xに所定間隔を置いて配されている。吸収性コア5における背側部Bに位置する吸収性コア背側領域52に、本体幅方向Yに延びる線状の幅方向溝部6が形成されており、外包体背側領域32の外包体形成用弾性部材33が吸収性コア背側領域52を本体幅方向Yに横断している。【選択図】図5
