PROBLEM TO BE SOLVED: To provide an underpants-type diaper which is less likely to cause detachment of a leg peripheral elastic member while sufficiently securing welding strength at side parts.SOLUTION: An absorbent article manufacturing method includes: a proces of forming an adhesion region on both sides of a cutting position in a conveyance direction of a lower side belt-like member a process of arranging a part of a leg peripheral elastic member in a state of being expanded in a direction including a component of the conveyance direction to be overlapped with the adhesion region a process of superposing an upper side belt-like member on the lower side belt-like member and the leg peripheral elastic member to adhere them to one another in the adhesion region a proces of folding the lower side belt-like member and the upper side belt-like member a process of welding the lower side belt-like member and the upper side belt-like member and a process of cutting the lower side belt-like member, the upper side belt-like member, the leg peripheral elastic member together at the cutting position to separate a lower side exterior member and an upper side exterior member that are formed into a shape of underpants and contracting the expanded leg peripheral elastic member from a position where the leg peripheral elastic member is cut toward the adhesion region while the leg peripheral elastic member is displaced relatively to the lower side exterior member and the upper side exterior member.COPYRIGHT: (C)2015,JPO&INPIT【課題】サイド部分における溶着強度を十分に確保しつつ、脚周り弾性部材が離脱しにくいパンツ型おむつの製造方法を提供する。【解決手段】下側帯状部材の切断箇所の搬送方向両側に接着領域を形成する工程と、搬送方向の成分を含む方向に伸長させた状態の脚周り弾性部材の一部が接着領域と重なるように配置する工程と、下側帯状部材及び脚周り弾性部材の上に上側帯状部材を重ねて接着領域にて接着する工程と、下側帯状部材及び上側帯状部材を折り畳む工程と、下側帯状部材及び上側帯状部材を溶着する工程と、下側帯状部材及び上側帯状部材及び脚周り弾性部材を切断箇所において一緒に切断し、パンツ型に成形された下側外装部材及び上側外装部材を切り離すとともに、伸長させた脚周り弾性部材を下側外装部材及び上側外装部材に対して相対的に変位させつつ脚周り弾性部材が切断された箇所から接着領域に向けて収縮させる工程と、を有する。【選択図】図3
