A slider for a slide fastener, comprising: a slider body configured to mesh and separate a pair of element rows (4L, 4L) with and from each other, the pair of element rows extending in a front-rear direction and facing with each other in a left-right direction, wherein the slider body includes a pair of wing plates (7, 8) having facing surfaces (71, 81) that face with each other in an upper-lower direction, a pillar connecting front portions of the pair of wing plates (7, 8) with each other in the upper-lower direction at intermediate portions of the wing plates (7, 8) in the left-right direction, and an element passage penetrating in the front-rear direction between the pair of wing plates (7, 8), a front side of the element passage being bifurcated into left and right sides of the pillar, at least one of the wing plates (7, 8) is provide with guiding surfaces (72, 82) for guiding the pair of separated element rows (4L, 4L) on both left and right sides with respect to the pillar at a front edge portion of the facing surface (71, 81) thereof, the guiding surface (72, 82) is an inclined surface that is inclined with respect to a horizontal direction such that a distance between the pair of wing plates (7, 8) in the upper-lower direction decreases from the front edge portion of the facing surface (71, 81) toward a rear side of the element passage, and includes a first inclined surface portion (73, 83), a second inclined surface portion (74, 84), and a third inclined surface portion (75, 85) that are sequentially arranged adjacent to each other in a direction away from the pillar on a left side or right side, characterized in that an inclination angle of the second inclined surface portion (74, 84) is an acute angle so that the second inclined surface portion (74, 84) is closer to a horizontal plane than the first inclined surface portion (73, 83) and the third inclined surface portion (75, 85), and a maximum depth width of the second inclined surface portion is longer than a maximum depth width of the first inclined surface portion (73, 83) and a maximum depth width of the third inclined surface portion (75, 85). a slider body configured to mesh and separate a pair of element rows (4L, 4L) with and from each other, the pair of element rows extending in a front-rear direction and facing with each other in a left-right direction, wherein the slider body includes a pair of wing plates (7, 8) having facing surfaces (71, 81) that face with each other in an upper-lower direction, a pillar connecting front portions of the pair of wing plates (7, 8) with each other in the upper-lower direction at intermediate portions of the wing plates (7, 8) in the left-right direction, and an element passage penetrating in the front-rear direction between the pair of wing plates (7, 8), a front side of the element passage being bifurcated into left and right sides of the pillar, at least one of the wing plates (7, 8) is provide with guiding surfaces (72, 82) for guiding the pair of separated element rows (4L, 4L) on both left and right sides with respect to the pillar at a front edge portion of the facing surface (71, 81) thereof, the guiding surface (72, 82) is an inclined surface that is inclined with respect to a horizontal direction such that a distance between the pair of wing plates (7, 8) in the upper-lower direction decreases from the front edge portion of the facing surface (71, 81) toward a rear side of the element passage, and includes a first inclined surface portion (73, 83), a second inclined surface portion (74, 84), and a third inclined surface portion (75, 85) that are sequentially arranged adjacent to each other in a direction away from the pillar on a left side or right side, characterized in that an inclination angle of the second inclined surface portion (74, 84) is an acute angle so that the second inclined surface portion (74, 84) is closer to a horizontal plane than the first inclined surface portion (73, 83) and the third inclined surface portion (75, 85), and a maximum depth width of the second inclined surface portion is longer than a maximum depth width of the first inclined surface portion (73, 83) and a maximum depth width of the third inclined surface portion (75, 85).