To prevent deterioration of a pleats' appearance in an expansion direction using porous non-woven fabric.SOLUTION: An expansion structure of a disposable wearing article has many thin and long elastic members 19 which are arranged between outside non-woven fabric layer 12S and inside non-woven fabric layer 12H at intervals in the direction orthogonal to an expansion direction ED that expand along the expansion direction ED. The outside non-woven fabric layer 12S is porous non-woven fabric where holes 14 penetrating in the thickness direction are arranged. A sheet joint part joining the outside non-woven fabric layer 12S and the inside non-woven fabric layer 12H is formed by hot-melt adhesives 14H applied in a stripe pattern at intervals in the expansion direction ED and continuing in the orthogonal direction XD. Adjacent sheet joint parts 70 are non-joint parts 71； difference in gap between columns 91, 92 of holes positioned nearest the sheet joint parts 70 and gaps 91d, 92d from the sheet joint parts 70 adjacent to the same on both sides in the expansion direction ED of the respective non-joint parts 71 is equal to or smaller than 14w dimension in the expansion direction of the holes 14.SELECTED DRAWING: Figure 17【課題】有孔不織布を用いた伸縮構造において、襞の外観の悪化を防止する。【解決手段】上記課題は、外側不織布層１２Ｓ及び内側不織布層１２Ｈの間に伸縮方向ＥＤと直交する直交方向ＸＤに間隔を空けて配置された、伸縮方向ＥＤに沿って延びる複数本の細長状の弾性部材１９を有し、外側不織布層１２Ｓは、厚み方向に貫通する孔１４が配列された有孔不織布であり、外側不織布層１２Ｓ及び内側不織布層１２Ｈを接合するシート接合部が、伸縮方向ＥＤに間隔を空けて、かつ直交方向ＸＤに連続する縞状パターンで塗布されたホットメルト接着剤１４Ｈにより形成され、隣接するシート接合部７０の間は非接合部７１となり、各非接合部７１の伸縮方向ＥＤの両側における、最もシート接合部７０寄りに位置する孔の列９１，９２とこれに隣接するシート接合部７０との間隔９１ｄ，９２ｄの差が、孔１４の伸縮方向の寸法１４Ｗ以下であることにより解決される。【選択図】図１７
