The present invention provides a stretchable sheet in which the stretching characteristics vary along the width direction thereof, a disposable wearing article using the stretchable sheet in which the stretching characteristics along the width direction, and a method for manufacturing the same. According to the present invention, an elastic resin material having a main component of a thermoplastic elastic resin is extruded into a sheet shape on a die and made to have a thickness that varies along the width direction, and then is cooled, to a temperature range in which the elastic resin material elastically deforms, to form a sheet body (3) that varies in thickness along the width direction, and a stretchable sheet (8) is formed by laminating and joining base sheets (4, 6) to the main surface on at least one side of the sheet body (3). The sheet body (3) includes at least two first and second regions (3m； 3s, 3t) which are adjacent to each other in the width direction, and the thicknesses of the second regions (3s, 3t) are greater than the thicknesses of the first regions (3m). In a disposable wearable article, the stretchable sheet (8) is disposed so that at least a portion of the second regions (3s, 3t) are closer to an opening around a body or an opening around a leg of the disposable wearable article than the first regions (3m).La présente invention concerne une feuille étirable dans laquelle les caractéristiques d'étirement varient le long de la direction de sa largeur, un article vestimentaire jetable utilisant la feuille étirable dans laquelle les caractéristiques d'étirement varient le long de la direction de la largeur, et un procédé de fabrication associé. Selon la présente invention, un matériau de résine élastique ayant un composant principal en résine élastique thermoplastique est extrudé en une forme de feuille sur une matrice et amené à présenter une épaisseur qui varie le long de la direction de la largeur, puis est refroidi, jusqu'à une plage de temp
