The present invention (hereinafter referred to as "sheet-production" hereinafter), wherein the high-hardness comprising: a sheet attached to the surface of the window member in a display window member manufacturing method for a portable terminal; Polymethyl methacrylate (polymethylmethacrylate; PMMA) resin or polycarbonate (ploycarbonate; PC) (hereinafter referred to as "body-production & quot;) step of making the body of the window member with a resin; And starting the step (hereinafter referred to as "attaching step" hereinafter) and wherein the body in the production stage the window member is an outer surface of the body is fabricated with a curved surface making method for adhering to the outer surface of the high hardness and the sheet body do. Wherein the window member manufacturing method for a display of a mobile terminal such, the high hardness to ensure the surface hardness easy because attaching the sheet to the body of the window member, and a curved surface it is possible to manufacture by injection molding the body of the window member with a surface of shape it is possible to inexpensively create a variety of shapes of the window member.