A braking device for a dual-bearing reel for braking a spool rotatably mounted on a reel body, includes a spool brake and a spool controller. The spool brake is configured to brake the spool by electromagnetic induction during casting of a fishing line. The spool controller is configured to control a braking force of the spool brake by controlling an ON/OF-state of current that is generated due to the electromagnetic induction at a prescribed period. The spool controller has a period changer configured to change the prescribed period for braking the spool.[課題]提供一種可以將制動力穩定地作用於捲筒之雙軸承捲線器的制動裝置。[技術內容]雙軸承捲線器的制動裝置(9)，是具備：捲筒制動部(11)、及捲筒控制部(13)。捲筒制動部(11)，是在釣線的吐出中藉由電磁感應而將捲筒(7)制動。捲筒控制部(13)，是藉由將藉由電磁感應而發生的電流由規定的第1及第2週期(TP1)、(TP2)導通斷開控制，而將捲筒制動部(11)的制動力可控制地構成。捲筒控制部(13)，是具有週期變更部(116)。週期變更部(116)，是將捲筒制動用的第1週期(TP1)變更成捲筒制動用的第2週期(TP2)。
