A slider (10, 60) for a slide fastener comprising: a slider main body (11, 51) configured to engage and disengage a pair of fastener elements; a pull tab (12, 12A, 12B, 12C) which is attached to a pull tab attachment portion of the slider main body; a stopper hook (13,61) having one end configured to be engaged with the fastener elements to obstruct the slider main body from moving; a spring portion (32, 62); a cam portion configured to urge the pull tab in a direction in which the pull tab returns to a lay-down state where the pull tab is lay down toward one side of the slider main body using an elastic force of the spring portion when the pull tab pivots from the lay-down state to an erected state; and regulating portions (30, 47, 47B, 20c) configured to obstruct the pull tab from pivoting further from the erected state, so that the pull tab is obstructed from lying down to the other side of the slider main body, wherein the regulating portions (30, 47, 47B, 20c) is comprised of: pull tab-side regulating portions (47, 47B) which are formed on the pull tab (12, 12A, 12B, 12C); and slider-side regulating portions (30, 20c) which are formed on the slider main body, and wherein the pull tab-side regulating portions abut against the slider-side regulating portions, thereby obstructing the pull tab from pivoting further from the erected state, characterized in that the slider main body is comprised of a slider body (14, 14A) and a cover body which is fixed to the slider body, wherein the cover body comprises: a receiving portion which receives the stopper hook (13, 61) and the spring portion (32, 62), and an opening portion provided with a partition plate which comes into contact with the shaft portion to pivotably hold the pull tab (12, 12A, 12B), and wherein the slider-side regulating portions are formed on a circumferential wall of the opening portion. a slider main body (11, 51) configured to engage and disengage a pair of fastener elements; a pull tab (12, 12A, 12B, 12C) which is attached to a pull tab attachment portion of the slider main body; a stopper hook (13,61) having one end configured to be engaged with the fastener elements to obstruct the slider main body from moving; a spring portion (32, 62); a cam portion configured to urge the pull tab in a direction in which the pull tab returns to a lay-down state where the pull tab is lay down toward one side of the slider main body using an elastic force of the spring portion when the pull tab pivots from the lay-down state to an erected state; and regulating portions (30, 47, 47B, 20c) configured to obstruct the pull tab from pivoting further from the erected state, so that the pull tab is obstructed from lying down to the other side of the slider main body, wherein the regulating portions (30, 47, 47B, 20c) is comprised of: pull tab-side regulating portions (47, 47B) which are formed on the pull tab (12, 12A, 12B, 12C); and slider-side regulating portions (30, 20c) which are formed on the slider main body, and pull tab-side regulating portions (47, 47B) which are formed on the pull tab (12, 12A, 12B, 12C); and slider-side regulating portions (30, 20c) which are formed on the slider main body, and wherein the pull tab-side regulating portions abut against the slider-side regulating portions, thereby obstructing the pull tab from pivoting further from the erected state, characterized in that the slider main body is comprised of a slider body (14, 14A) and a cover body which is fixed to the slider body, wherein the cover body comprises: a receiving portion which receives the stopper hook (13, 61) and the spring portion (32, 62), and an opening portion provided with a partition plate which comes into contact with the shaft portion to pivotably hold the pull tab (12, 12A, 12B), and wherein the slider-side regulating portions are formed on a circumferential wall of the opening portion. a receiving portion which receives the stopper hook (13, 61) and the spring portion (32, 62), and an opening portion provided with a partition plate which comes into contact with the shaft portion to pivotably hold the pull tab (12, 12A, 12B), and wherein the slider-side regulating portions are formed on a circumferential wall of the opening portion.