A spool for a spinning reel comprising: a cylindrical bobbin trunk having an outer periphery configured for winding fishing line thereon; a front flange portion, including a first protruding portion (17a, 117a) that protrudes outward in a radial direction from a front end portion of the bobbin trunk, a first oblique portion (17b, 117b) that protrudes forward from a tip of the first protruding portion, the first oblique portion having a diameter that increases from the tip of the first protruding portion to a front end side of the first oblique portion, and a first corner portion; a rear flange portion, including a second protruding portion that protrudes outward in the radial direction from a rear end portion of the bobbin trunk, and a second oblique portion that protrudes rearward from a tip of the second protruding portion, the second oblique portion having a diameter that increases from the tip of the second protruding portion; wherein the second protruding portion having a length that is approximately the same as a length of the first protruding portion in the radial direction; wherein a base end portion of the second oblique portion is formed in a continuation with the tip of the second protruding portion so that a continuation portion is formed at an angle, thereby forming a pointed-shaped second corner portion at a boundary of the base end portion of the second oblique portion and the tip of the second protruding portion; wherein the first corner portion is formed pointed-shaped rearwardly and on a boundary between the first oblique portion and the first protruding portion, the first corner portion and the second corner portion serving as an indication for a maximum winding position of the fishing line. a cylindrical bobbin trunk having an outer periphery configured for winding fishing line thereon; a front flange portion, including a first protruding portion (17a, 117a) that protrudes outward in a radial direction from a front end portion of the bobbin trunk, a first oblique portion (17b, 117b) that protrudes forward from a tip of the first protruding portion, the first oblique portion having a diameter that increases from the tip of the first protruding portion to a front end side of the first oblique portion, and a first corner portion; a rear flange portion, including a second protruding portion that protrudes outward in the radial direction from a rear end portion of the bobbin trunk, and a second oblique portion that protrudes rearward from a tip of the second protruding portion, the second oblique portion having a diameter that increases from the tip of the second protruding portion; wherein the second protruding portion having a length that is approximately the same as a length of the first protruding portion in the radial direction; wherein a base end portion of the second oblique portion is formed in a continuation with the tip of the second protruding portion so that a continuation portion is formed at an angle, thereby forming a pointed-shaped second corner portion at a boundary of the base end portion of the second oblique portion and the tip of the second protruding portion; wherein the first corner portion is formed pointed-shaped rearwardly and on a boundary between the first oblique portion and the first protruding portion, the first corner portion and the second corner portion serving as an indication for a maximum winding position of the fishing line.