PROBLEM TO BE SOLVED: To provide an expansion and contraction structure including a pleat extended straightly, which is excellent in appearance, permeability, and also flexibility.SOLUTION: An expansion and contraction structure is provided in which a first sheet material 12S and a second sheet material 12H are bonded by the adhesive agent 71 intermittently arranged in an expansion/contraction direction and continuously extended in a direction crossing the expansion/contraction direction to form a sheet joint part 70. The adhesive agent 71 is continued in the direction crossing the expansion/contraction direction at a portion where the sheet joint part 70 crosses an elastic expansion/contraction member and at the first sheet material 12S side of the elastic expansion/contraction member so that the elastic expansion/contraction member is fixed to the first sheet material 12S by the adhesive agent 71, and the adhesive agent 71 is not continued in the direction crossing the expansion/contraction direction at the second sheet material 12H side of the elastic expansion/contraction member. The first sheet material 12S and the second sheet material 12H are contracted along with contraction of the elastic expansion/contraction member so that portions positioned between the sheet joint parts 70 in the first sheet material 12S and the second sheet material 12H are expanded in mutually opposite directions to respectively form pleats 80.COPYRIGHT: (C)2015,JPO&INPIT【課題】襞が真直ぐに延び、見栄え、通気性に優れるものでありながら、柔軟性にも優れる伸縮構造を提供する。【解決手段】上記課題は、第1シート材12S及び第2シート材12Hが、伸縮方向に間欠的に配された、伸縮方向と交差する方向に連続する接着剤71により接合されて、シート接合部70が形成され、シート接合部70と弾性伸縮部材とが交差する部分のうち、弾性伸縮部材の第1シート材12S側で接着剤71が伸縮方向と交差する方向に連続することにより弾性伸縮部材が接着剤71により第1シート材12Sに固定されるとともに、弾性伸縮部材の第2シート材12H側では接着剤71が伸縮方向と交差する方向に不連続となっており、弾性伸縮部材の収縮に伴い第1シート材12S及び第2シート材12Hが収縮することにより、第1シート材12S及び第2シート材12Hにおけるシート接合部70間に位置する部分が互いに反対向きに膨らんでそれぞれ襞80が形成されている伸縮構造により解決される。【選択図】図6
