To inexpensively attach a synthetic resin-made fuel nozzle to a main body of a diaphragm type carburetor to provide a stable flow characteristic.

A collar part 14 is provided on a base end of the synthetic resin-made fuel nozzle 9, and the collar part 14 is held between an upper wall of an attaching hole 12 of the fuel nozzle and a check valve 16 or a plug 50. By this, since the collar part 14 is held between the upper wall of the attaching hole 12 of the fuel nozzle and the check valve 16 or the plug 50, the fuel nozzle 9 can be stably and accurately held for a long period even when stress relaxation due to plastic deformation occurs in the collar part 14 of the fuel nozzle pressed in the attaching hole 12. Since the whole of the fuel nozzle can be made by synthetic resin, it is inexpensive.