the slider slides to engage element arrays is defined as front and the direction towards which the slider slides to separate the element arrays is defined as rear the direction orthogonal to the upper and lower wing plates is defined as the vertical direction and the direction parallel to the upper and lower wing plates and orthogonal to the direction of sliding of the slider is defined as the transverse direction the slider for slide fastener 1 a of example 1 has as seen in fig1 fig2 and fig5 a slider body 2 a pull 5 swingably held at one end thereof by the slider body 2 and a locking pawl 6 disposed in the slider body 2 in the slider 1 a of example 1 the slider body 2 and the pull 5 are manufactured by die casting using a metal material such as copper alloy aluminum alloy or zinc alloy the locking pawl 6 is manufactured by using a metal material such as stainless steel or copper alloy by press forming the slider body 2 has as seen in fig1 fig2 and fig5 an upper wing plate 21 a lower wing plate 22 and a connection post 23 which connects the upper and lower wing plates 21 22 at front end side thereof upper flanges 24 are formed on the left and right edges of the upper wing plate 21 toward the lower wing plate 22 lower flanges 25 are formed on the left and right edges of the lower wing plate 22 toward the upper wing plate 21 furthermore the slider body 2 has as seen in fig1 fig2 and fig5.