A dual-bearing reel spool-braking device configured to brake a spool rotatably attached to a reel body having first and second side plates has a tubular brake member, a moving member, and a cover member. The tubular brake member is attached to the first or second side plate, and has a base and an opening. The brake member is disposed such that the opening is opposed to the spool. The moving member is axially non-movably attached to a rotation shaft of the spool, and contacts an inner peripheral surface of the brake member when the moving member is moved towards the brake member by centrifugal force generated by rotation of the spool. The cover member is attached to the first or second side plate to cover the opening of the brake member.