To provide a fuel jet supporting structure of a carburetor in which the inlet and outlet sides of an air passage hole are sealed more completely.

In a fuel passage for introducing to the intake passage 9 of a carburetor body 2 fuel in a fuel vessel arranged in a strut 15 projected from the bottom part of the carburetor body 2 to the inside of the fuel vessel, a fuel passage hole 24 for fitting/supporting a fuel jet body 25, an air passage hole 19 connected to an air introducing passage 13, a screw hole 18 and an outlet passage hole 16 are formed in a manner that their inside diameters are gradually shortened. A taper hole 17 is formed in a stage part between the screw hole 18 and the outlet passage hole 16, and in the fuel jet body 25, a fuel jet 30 is arranged in the intermediate part of a fuel passage penetrated through the fuel jet body 25. Many radial passing holes 29 are arranged in a part placed in the air passing hole 19 so as to form an emulsion pipe, a screw part screwed in the screw hole 18 is formed in an end part, and a taper shaft part abutted on the taper hole 17 is formed at an end.