A reverse prevention mechanism is configured to prevent reverse rotation of a drag disk (42), in a line-releasing direction, when braking a spool (3). The reverse prevention mechanism includes a rotation member (30), a pawl member (31), and an urging member (32). The rotation member (30) includes an outer periphery portion (30b) with a plurality of engaging members. The outer periphery portion (30b) is arranged between the second pinion gear (22) and the drag disk, and is capable of rotating integrally with the drag disk (42). The pawl member (31) is pivotally coupled to the reel unit (1). The pawl member (31) is arranged in an engagement position and a remote position. In the engagement position, reverse rotation is prevented when the pawl member (31) is engaged with the outer periphery portion (30b) of the rotation member (30). In the remote position, the pawl member (31) is detached from the outer periphery portion (30b). The urging member (32) urges the pawl member (31) toward the engagement position.
