A drag adjusting device for a dual-bearing reel, including a reel unit (1) with a drag operating member (2) configured to pivot within a range between a minimum position and a maximum position. A plate member (80) is attached to an outer side of the reel unit (1). A drag restricting member (70) is detachably coupled to the outer side surface of the plate member (80) and between the minimum and the maximum pivot position of the drag operating member (2). The drag restricting member (70) is detachably coupled to the plate member (80) so as to contact and restrict pivotal movement of the drag operating member (2).