PROBLEM TO BE SOLVED: To provide a high-density region-containing sheet having both a high density region and a low density region.SOLUTION: A sheet member 5 includes a first sheet, a second sheet and at least one elastic member 4 arranged between the first sheet and the second sheet and exhibiting any one state of a yarn-like, net-like, belt-like and sheet-like states. The first sheet is formed with a plurality of high-density regions 21 and a plurality of low-density regions 22 in the predetermined direction continuously and alternately before being joined to the elastic member 4. The elastic member 4 is arranged in the direction where the plurality of high-density regions 21 and the plurality of low-density regions 22 are formed in the predetermined direction substantially alternately and continuously. At least one portion of the plurality of high-density regions 21 is jointed to the extended elastic member 4.COPYRIGHT: (C)2012,JPO&INPIT【課題】高密度領域と低密度領域とを有する高密度領域含有シートを提供する。【解決手段】 第一のシートと、第二のシートと、第一のシートと第二のシートとの間に配置された糸状、ネット状、帯状、シート状のうちのいずれかの状態を呈する、少なくとも1つの弾性部材4と、を備えているシート部材5であって、第一のシートには、複数の高密度領域21と、複数の低密度領域22とが、弾性部材4に接合される前に所定方向に交互に連続的に形成されており、弾性部材4は、複数の高密度領域21と、複数の低密度領域22とが所定方向に実質的に交互に連続的に形成している方向に沿うように配置され、複数の高密度領域21における少なくとも一部は、伸張した状態の弾性部材4に接合されていることを特徴とするシート部材5を提供する。【選択図】図2