Provided is a bait casting reel for preventing friction or break of a spool plate and a braking magnet due to contact by deformation of a rotary shaft of a spool or a friction washer, etc., by employing a variable spool plate coupled to be able to move left and right in the longitudinal direction of a spool shaft so that a user can easily and freely adjust a braking force after setting a maximum braking force of a braking magnet without replacing or changing parts, and by enabling a user to perform zero adjustment such that the spool plate and the braking magnet is minimally spaced to set a maximum braking force of the braking magnet by moving the spool plate and the braking magnet in contact with each other when the spool plate is moved the outermost side.
