To provide a fuel supplying device for a liquefied gas engine with improved fuel efficiency and drastically enhanced combustibility.

In the fuel supplying device for the liquefied gas engine wherein pressure of fuel led from a fuel tank 1 is boosted and accumulated in a common rail 5 and the fuel is led from the common rail 5 to an injector 7 provided on the top of a cylinder so that the fuel is jetted in a combustion chamber 8, a sub-injector 13 is provided at an appropriate position of an air intake passage 10 for leading intake air 9 to each cylinder, and a premixed line 15 for vaporizing the fuel drawn out of a gas phase part in the fuel tank 1 through a vaporizer 14 and leading the fuel to the sub-injector 13 is provided.