A fishing reel includes a spool rotatably mounted in a reel body and having two end portions each formed with a disk-shaped wheel. A supporting bracket is fixedly mounted on the reel body and includes an inner wall. A braking device is pivotally mounted in the supporting bracket and includes a first end portion formed with two braking arms each detachably abutting on the wheel of the spool and a second end portion extending outwardly from the supporting bracket. A torsional spring includes a first end urged on the inner wall of the supporting bracket and a second end urged on the second end portion of the braking device.