In the composite elastic member formed a elastic member by joining the two sheet material sandwiched between the sheet material to provide a composite elastic member is less possibility that the elastic member is cut. composite elastic member 1, the two sheet materials 2,2a elongated, overlapping aligned in the longitudinal direction, a plurality of elastic members 3 extending in the longitudinal direction of both the sheet material 2,2a a is formed substantially sandwiched between parallel to both the sheet material 2,2a each other. Both sheet materials 2,2a are joined together at joint 4 made of hot-melt material which is continuously applied along the direction perpendicular to the longitudinal direction of the sheet material 2,2a. The joint unit 4 through the elastic member 3 of said plurality of lines. Between junction 4 adjacent in on both sheets 2,2a, by contracting action of the elastic member 3, and perpendicular to the longitudinal direction of the sheet material 2,2a extending over the elastic member 3 of the plurality of a plurality of folds 40 are formed.弾性部材を両シート材間に挟み両シート材を接合して形成される複合伸縮部材において、弾性部材が切断される可能性が少ない複合伸縮部材を提供する。 複合伸縮部材1は、長尺の2枚のシート材2、2aを、長手方向を揃えて重ね、両シート材2、2aの長手方向に沿って延びた複数本の弾性部材3を互いに略平行に両シート材2、2a間に挟んで形成される。両シート材2、2aは、該シート材2、2aの長手方向に直交する向きに沿って連続的に塗布されたホットメルト材からなる接合部4にて互いに接合される。該接合部4は前記複数本の弾性部材3を通る。両シート材2、2a上にて隣り合う接合部4間には、弾性部材3の収縮作用によって、該シート材2、2aの長手方向に直交し前記複数本の弾性部材3に亘って延びた複数本の襞40が形成されている。
