Disclosed herein is a click sound generating device for a bait reel. The bait reel includes a reel frame, a spool, a handle and a drag knob. The spool is rotatably mounted to the reel frame. A fishing line is wound around the circumferential outer surface of the spool. The handle is connected to the spool through a gear shaft. The drag knob is provided between the handle and the gear shaft to adjust the drag strength of the spool. The click sound generating device is in the drag knob and generates clicking sounds depending on rotation of the drag knob, thus enabling a user to minutely and precisely control the drag strength or rotating force of the spool.