The present invention relates to a fly reel, wherein the drag system installed in frame comprises: a drag knob that is connected rotation-controllably to one side periphery of center shaft; a drag spindle that is connected rotationally to periphery of said center shaft and distantly from said drag knob; a friction means for restraining controllably any one-directional rotation force of said drag spindle in accordance with transferred amount of said drag knob moved to axial direction of said center shaft; a drag spindle insert that is inserted rotationally to periphery of said center shaft and rotated by rotational manipulation of said spool; and a unidirectional bearing that is inserted at inside of said drag spindle for permitting one directional rotation and restraining the other directional rotation of said drag spindle insert being inserted therein. Overall configuration thereby can be made efficient and simple; direction setting of unidirectional bearing can be changed easily if necessary.