PROBLEM TO BE SOLVED: To suppress increase in rigidity of a stretchable sheet having three or more layers with a rubber thread interposed. SOLUTION: A first sheet portion (11), a second sheet portion (12) and a third sheet portion (13) are laminated, and between the first sheet portion (11) and the second sheet portion (12). A method for manufacturing a stretchable sheet (10) having a rubber thread (14) arranged, comprising: a first sheet portion (11), a second sheet portion (12), a third sheet portion (13), and a rubber thread (14). ) Are supplied between the pair of crimping portions (22) in a state where they are not joined to each other, and the pair of crimping portions (22) are used to supply the first sheet portion (11) and the second sheet portion (12). And a third sheet portion (13) are pressure-bonded to each other to join the first sheet portion (11), the second sheet portion (12), and the third sheet portion (13). Forming a plurality of joints (j) that regulate the position of the rubber thread (14) with respect to and. [Selection diagram] Fig. 4【課題】糸ゴムを介在させた３層以上の伸縮性シートの高剛性化を抑えること。【解決手段】第１シート部（１１）と第２シート部（１２）と第３シート部（１３）とが積層され、第１シート部（１１）と第２シート部（１２）の間に糸ゴム（１４）が配された伸縮性シート（１０）の製造方法であって、第１シート部（１１）と第２シート部（１２）と第３シート部（１３）と糸ゴム（１４）とを、互いに接合されていない状態で、一対の圧着部（２２）間に供給し、一対の圧着部（２２）を用いて、第１シート部（１１）と第２シート部（１２）と第３シート部（１３）とを圧着して互いに接合する複数の接合部（ｊ）であって、第１シート部（１１）と第２シート部（１２）と第３シート部（１３）とに対して糸ゴム（１４）の位置を規制する複数の接合部（ｊ）を形成すること。【選択図】図４
