The lamination expansion and contraction seat and its production method of this invention, paralleling to the snapping line WL which, extends to the machine direction of continual seat W1 and W2 expansion and contraction possible elastic member F becoming loose in process and the cross direction Y which form extension possible loose section W1b and W2b by the fact that it shortens continual seat W1 and W2 to cross direction Y adjusting to section W1b and W2b and both ends to continual seat W1 and W2 at least, the cross direction Y in elastic member F the case of process and the arrangement which arrange after continual seat W1 and W2 connecting process and the loose section W1b which form the compound seatIt has with continual seat W1, W2 and the process which elastic member F connects intermittently, in the intermediate section between process and both ends which extend W2b and elastic member F in cross direction Y.本発明の積層伸縮シートおよびその製造方法は、連続シートW1,W2の流れ方向に延びる折りラインWLに沿って幅方向Yに連続シートW1,W2を縮めることで伸張可能な弛み部W1b,W2bを形成する工程と、幅方向Yに伸縮可能な弾性部材Fを弛み部W1b,W2bに合わせて連続シートW1,W2上に配置する工程と、配置の際に弾性部材Fにおける幅方向Yの少なくとも両端部を連続シートW1,W2に接合して複合シートを形成する工程と、弛み部W1b,W2bおよび弾性部材Fを幅方向Yに伸張する工程と、両端部の間の中間部において連続シートW1,W2と弾性部材Fとを間欠的に接合する工程とを備えている。
