To provide a carburetor for two cycle internal combustion engine wherein a little fuel is introduced from the fuel passage of the carburetor to an intake passage.

An injection port 22 and an exhaust port 6 opening to a combustion chamber 4, and an intake port 25b and an air entrance 24 which open to a crank room 13a in a vertical line are provided in the cylinder wall 3 of the engine, and an injection pipe 23 is provided to connect the air entrance 24 and the injection port 22 to each other. An intake passage 25 ranging to the intake port 25b and the fuel passage 21 ranging to the half way to the injection pipe 23 are provided in a carburetor body 34, and a throttle valve 39 having a throttle hole 36 ranging to the intake passage 25 is inserted into a cylindrical valve chamber 35 intersecting the intake passage 25 fittedly so as to be turnable and movable vertically. A fuel supply pipe 20 crossing the fuel passage 21 along the shaft center of the throttle valve 39 from a fuel chamber 47 of a lower section is supported on the carburetor body 34. A needle 37 is inserted into the fuel injection hole 38 of the fuel supply pipe 20 fittedly, which extends downward from the throttle valve 39 and face to the fuel passage 21 to adjust the opening degree of the fuel injection hole 38.