The present invention relates to a bait casting reel including a braking magnet, capable of providing rotation braking force of a spool through magnetic force to prevent a backlash of the spool during casting. In order to prevent the damage or abrasion of the braking magnet, caused by contact with the spool when a friction washer or rotational shaft of the spool is deformed, and to enable a user to randomly control braking force of the braking magnet without changing a component, the spool and a backlash prevention part are configured to touch each other when a braking dial, which moves the backlash prevention part in an axial direction of the spool, is maximally rotated. As such, the user is able to adjust a zero point by minimizing a gap between the backlash prevention part and the spool for setting the maximum braking force of the braking magnet.COPYRIGHT KIPO 2017