The posted content is to prevent the tension adjustment knob from being lost due to detachment from the reel body even when the tension adjustment knob is loosened all the way to adjust the luer's weight or optimal casting condition. It relates to a bait cast reel equipped with a prevention device, The bait cast reel provided with a tension adjustment knob separation prevention device according to an embodiment of the present specification is A reel body on which a spool shaft is rotatably installed； A cylindrical frame coupled to an opening on one side of the reel body, having a first screw portion formed on an outer circumference thereof, an elastic protrusion for generating a click sound, installed to be movable, and open at both ends； A click plate rotatably coupled to an opening on one side of the frame and having a click groove formed in a circumferential direction on the bottom surface so that the elastic protrusion is clicked upon rotation to generate a click sound； A control plate supporting the spool shaft, coupled to the through hole of the click plate and integrally rotated； A second screw portion corresponding to the first screw portion of the frame is formed on the inner periphery, and the flange of the control plate is integrally fixed to the inner bottom surface, and the tension force of the spool is adjusted when rotating and the click sound is generated. A tension adjustment knob to rotate the control plate； A protruding jaw formed at an outer end of the wing-shaped protrusion formed to face the flange of the control plate； When the click plate has a ring-shaped locking protrusion formed on the inner periphery of the click plate, and when the tension adjustment knob is fully loosened in the direction of relaxation to adjust the tension force of the spool, the protruding protrusion is caught by the locking protrusion and the tension It provides a bait cast reel provided with a tension adjustment knob separation prevention device characterized in tha
