PROBLEM TO BE SOLVED: To provide an advantage such as improvement of wearability by forming a leg insertion part so that a leg is not caught by a three-dimensional gathers during wearing without increasing a manufacturing cost or time and labor on wearing.SOLUTION: A joint part 40 joined in a dotted state by thermally welding a section between an abdominal side part F and a back side part B of an exterior sheet 20 is configured to linearly extend toward two leg part openings 38, respectively, which exist from the side of a body part opening 36 to the side of a crotch part M.COPYRIGHT: (C)2013,JPO&INPIT【課題】製造コストを増大させたり、着用時の手間が増えたりすることなく、着用時に立体ギャザーに脚が引っかからないように脚を通す部分を形成して、着用性を改善する、等の利点がもたらされる。【解決手段】外装シート20における腹側部分Fと背側部分Bとの間を熱溶着により点状に接合した接合部40が、胴部開口36側から股下側部分M側に存在する2つの脚部開口38にそれぞれ向かって直線状に2本延びる構造とされる。【選択図】図1