A drag device which does not require a large number of parts, is easy to assemble, is highly corrosion resistant and can keep its commercial value. Brake plates and a friction plate provided in the drag device are inserted into a central recessed portion formed in a spool. A pressure member is non-rotatably fitted to the outer periphery of a rotation preventive portion of a leading end small diameter portion formed in a spool shaft, while a nut mounted to an operation member is threadingly engaged with a threaded portion formed in the leading end portion of the small diameter portion. After the pressure member and operation member are assembled together, a removal preventive member is superimposingly assembled to a stepped portion provided in the operation member and an engaging portion is secured by means of the elastic deformation of a securing portion, so that the pressure member is secured to the operation member rotatably but unremovably.