PROBLEM TO BE SOLVED: To provide an extensible structure while enabling significant reduction of material cost.SOLUTION: An extensible structure of an absorbent article is composed of a single air-permeable material 120 and comprising a sheet member 12S including a plurality of pleats 80 arranged in parallel to each other at intervals so as not to overlap each other in a lodging state and inter-pleat parts 85 in which the pleats 80 overlap each other in a lodging state, and slender elastic extensible members 90 arranged along the longitudinal direction of the pleats 80. The pleats 80 are joined to each other continuously or intermittently in the longitudinal direction of the pleats 80 so that at least opposing surfaces 80a and 80b of root parts 81 are not separated from each other. Outer surfaces of the pleats 80 are not joined to the inter-pleat parts 85 except for both ends of the pleats 80 in the longitudinal direction and the elastic extensible members 90 are arranged to the tip end side of the pleats 80 relative to the root parts 81 and at least both ends thereof are fixed between the opposing surfaces 80a and 80b of the pleats 80, in which contraction of the elastic extensible members 90 allows contraction of the pleats 80 and the inter-pleat parts 85.COPYRIGHT: (C)2015,JPO&INPIT【課題】資材コストを大幅に削減可能な伸縮構造を提供する。【解決手段】一枚の通気性素材120からなり、倒伏状態で重ならないように間隔を空けて複数並設された襞80、及び各襞80が倒伏した状態で重なる襞間部85を有するシート状部材12Sと、各襞80の対向面80a,80b間に、襞80の長手方向に沿って設けられた細長状の弾性伸縮部材90とを有しており、襞80は、少なくとも根元部81の対向面80a,80bが離間しないように襞80の長手方向に連続的又は間欠的に接合されており、襞80の外面は、襞80の長手方向の両端部を除いて襞間部85と接合されておらず、弾性伸縮部材90は、襞80の根元部81より先端側に配されるとともに、少なくともその両端部が襞80の対向面80a,80b間に固定されており、弾性伸縮部材90の収縮により、襞80及び襞間部85がそれぞれ収縮されている、吸収性物品の伸縮構造である。【選択図】図6
