Provided is a baitcast reel spool that provides a rotational braking force against a spool using a braking magnet to prevent backlash of the spool in casting, more particularly, to a baitcast reel spool having a replaceable plate, of which the plate that is attracted by a braking magnet can be easily, firmly, and safely attached to a side of the spool and can be easily detached so that a user can tune the reel by replacing the plate in accordance with his/her taste and necessity.
