A slider (2, 3) for a slide fastener including a slider body (10, 70) in which upper and lower blades (11, 12, 71, 72) are connected by a guide column, and first and second tab attachment posts (16, 17, 76, 77) are provided in a rising manner in an upper surface of the upper blade (11, 71), and a tab (50, 60, 90) in which a tab main body (51, 61, 91) and an attachment shaft portion (53, 63, 93) are connected by a pair of arm portions (52, 62, 92), wherein the first and second tab attachment posts (16, 17, 76, 77) are pressed in such a direction so as to come close to each other in a state in which the attachment shaft portion (53, 63, 93) of the tab (50, 60, 90) is inserted, and the attachment shaft portion (53, 63, 93) of the tab (50, 60, 90) is rotatably retained to the first and second tab attachment posts (16, 17, 76, 77), being characterized in that a cover body (20, 80) covering at least the first and second tab attachment posts (16, 17, 76, 77) is fixed to the upper blade (11, 71), the cover body (20, 80) has an upper surface portion, a front wall portion, a rear wall portion and right and left side wall portions, and is formed as a rectangular shape in a top elevational view, a movement control portion (53b, 63b, 93b) is arranged in the attachment shaft portion (53, 63, 93), the movement control portion controlling a movement of the tab (50, 60, 90) in an axial direction of the attachment shaft portion (53, 63, 93) with respect to the first and second tab attachment posts (16, 17, 76, 77), and securing a gap capable of accommodating the side wall portion of the cover body (20, 80), between outer side surfaces of the first and second tab attachment posts (16, 17, 76, 77) and the arm portion (52, 62, 92) of the tab (50, 60, 90), a distance between the inner surfaces of the right and left side wall portions in the cover body (20, 80) is set to be the same size of a width between the outer side surfaces of the first and second tab attachment posts (16, 17, 76, 77) in the slider body (10, 70), or be larger than the width, a distance between the outer surfaces of the right and left side wall portions in the cover body (20, 80) is set to be smaller than a distance between the arm portions (52, 62, 92) of the tab (50, 60, 90), and the right and left side wall portions in the cover body (20, 80) are accommodated between the outer side surface of the first and second tab attachment posts (16, 17, 76, 77) and the arm portions (52, 62, 92) of the tab (50, 60, 90). the first and second tab attachment posts (16, 17, 76, 77) are pressed in such a direction so as to come close to each other in a state in which the attachment shaft portion (53, 63, 93) of the tab (50, 60, 90) is inserted, and the attachment shaft portion (53, 63, 93) of the tab (50, 60, 90) is rotatably retained to the first and second tab attachment posts (16, 17, 76, 77), being characterized in that a cover body (20, 80) covering at least the first and second tab attachment posts (16, 17, 76, 77) is fixed to the upper blade (11, 71), the cover body (20, 80) has an upper surface portion, a front wall portion, a rear wall portion and right and left side wall portions, and is formed as a rectangular shape in a top elevational view, a movement control portion (53b, 63b, 93b) is arranged in the attachment shaft portion (53, 63, 93), the movement control portion controlling a movement of the tab (50, 60, 90) in an axial direction of the attachment shaft portion (53, 63, 93) with respect to the first and second tab attachment posts (16, 17, 76, 77), and securing a gap capable of accommodating the side wall portion of the cover body (20, 80), between outer side surfaces of the first and second tab attachment posts (16, 17, 76, 77) and the arm portion (52, 62, 92) of the tab (50, 60, 90), a distance between the inner surfaces of the right and left side wall portions in the cover body (20, 80) is set to be the same size of a width between the outer side surfaces of the first and second tab attachment posts (16, 17, 76, 77) in the slider body (10, 70), or be larger than the width, a distance between the outer surfaces of the right and left side wall portions in the cover body (20, 80) is set to be smaller than a distance between the arm portions (52, 62, 92) of the tab (50, 60, 90), and the right and left side wall portions in the cover body (20, 80) are accommodated between the outer side surface of the first and second tab attachment posts (16, 17, 76, 77) and the arm portions (52, 62, 92) of the tab (50, 60, 90).