The present invention concerns a fly fishing rod with a detachable reel and reel seat assembly. The fly fishing rod of the present invention comprises a rod shaft and a handgrip disposed at an inner end rod shaft, and is adapted for removably connecting a reel to the handgrip by means of a hollow cylindrical reel seat. The rod shaft of the fly fishing rod has a portion extending past the handgrip so as to mount the reel thereon through the reel seat, rearwardly of the handgrip. A sleeve like adapter is engaged over the shaft portion and comprises a locking groove. The reel seat is slidable over the adapter and has a stud portion arranged to be engaged in the locking groove for connecting the reel seat to the handgrip, and to be removed thereon by disengaging the stud portion from the locking groove, thereby making it possible to dispose the reel seat away from the fly fishing rod. The disclosure of the present invention also relates to a reel and reel seat assembly holding device and a waist holder for the holding device.