PROBLEM TO BE SOLVED: To improve the aesthetic appearance of an elastic member including an elastic sheet. SOLUTION: In the above problem, an elastic sheet 30 is interposed between a second sheet layer 20B having an exposed portion and a first sheet layer 20A, and the second sheet layer 20B and the first sheet layer 20A are spaced apart from each other. A large number of sheet joints 40 are joined through a joint hole 31 penetrating the elastic sheet 30 or through the elastic sheet 30, and at least in the expanded state, the edge of the joint hole 31 is the outer peripheral edge of the sheet joint 40. It has a ventilation hole 33 that opens away from the ventilation hole 33 in the expansion / contraction direction, and the color of the outer surface of the elastic sheet 30 and the color of the portion of the outer surface of the first sheet layer 20A seen from the ventilation hole 33 can be seen through the second sheet layer 20B. The problem is solved by the elastic member having a color difference ΔE between the color of the outer surface 30s of the elastic sheet 30 and the color of the outer surface 20s of the first sheet layer 20A of 30 or more. [Selection diagram] FIG.【課題】弾性シートを含む伸縮部材の美観を向上させる。【解決手段】上記課題は、露出部分を有する第２シート層２０Ｂと第１シート層２０Ａとの間に弾性シート３０が介在され、第２シート層２０Ｂ及び第１シート層２０Ａが、間隔を空けて配列された多数のシート接合部４０で、弾性シート３０を貫通する接合孔３１を通じて又は弾性シート３０を介して接合され、少なくとも展開状態で、接合孔３１の縁がシート接合部４０の外周縁から伸縮方向ＥＤに離れて開口する通気孔３３を有し、弾性シート３０の外面の色及び第１シート層２０Ａの外面における通気孔３３から覗く部分の色が、第２シート層２０Ｂを通して透視可能であり、弾性シート３０の外面３０ｓの色及び第１シート層２０Ａの外面２０ｓの色の色差ΔＥが３０以上である、ことを特徴とする伸縮部材により解決される。【選択図】図１６
