A method for manufacturing a metallic slider (100, 202) for a slide fastener, the slider comprising: an upper wing plate; a lower wing plate; a front end wall connecting the upper wing plate and the lower wing plate and having two front openings (107, 108) which are formed in different heights in an upper-lower direction and through which a pair of separated element rows are to be moved in and out; a back opening through which a pair of engaged element rows are moved in and out; and an element guide way which is arranged between the upper wing plate and the lower wing plate and communicates the two front openings (107, 108) with the back opening, wherein the front end wall has a plastically deformed portion and the method comprises steps of: molding a half-finished product of the slider with the back opening in an open state in the upper-lower direction; and forming the plastically deformed portion by plastic working in which with the front end wall itself as a fulcrum, the back opening is deformed from an open state to a closed state in the upper-lower direction, and wherein each of said two front openings (107, 108) exists so as to straddle a central line in a left-right direction, and in an overlapping portion in the left-right direction between a lower end of the upper front opening and an upper end of the lower front opening, an element guide pole is formed so as to lay in the left-right direction, characterized in that said element guide pole has a shape of an approximately isosceles triangle pole having its apex on a back opening side, and a front end side of the approximately isosceles triangle pole has a rounded shape. an upper wing plate; a lower wing plate; a front end wall connecting the upper wing plate and the lower wing plate and having two front openings (107, 108) which are formed in different heights in an upper-lower direction and through which a pair of separated element rows are to be moved in and out; a back opening through which a pair of engaged element rows are moved in and out; and an element guide way which is arranged between the upper wing plate and the lower wing plate and communicates the two front openings (107, 108) with the back opening, wherein the front end wall has a plastically deformed portion and the method comprises steps of: molding a half-finished product of the slider with the back opening in an open state in the upper-lower direction; and forming the plastically deformed portion by plastic working in which with the front end wall itself as a fulcrum, the back opening is deformed from an open state to a closed state in the upper-lower direction, and wherein each of said two front openings (107, 108) exists so as to straddle a central line in a left-right direction, and in an overlapping portion in the left-right direction between a lower end of the upper front opening and an upper end of the lower front opening, an element guide pole is formed so as to lay in the left-right direction, characterized in that said element guide pole has a shape of an approximately isosceles triangle pole having its apex on a back opening side, and a front end side of the approximately isosceles triangle pole has a rounded shape.