To provide a fuel infection device in which a full amount of fuel can be charged and combustion efficiency can be improved.

A fuel infection device for a combustion device for liquid fuel has a conduit 31 for an air flow. A conduit 56 for a flow of liquid fuel toward a housing is merged with a fuel charging chamber 25. The fuel charging chamber 25 has at least one feeding inlet orifice 22 and at least one feeding outlet orifice 34 in a substantial straight arrangement. The feeding inlet orifice 22 is connected to the conduit 31, thereby air in the gas flow during use is flowed toward the charging chamber in order to cause fuel outside the charging chamber to be forcedly fed into the chamber through the feeding-out port orifice. The gas flow may constitute a second gas flow and the first gas flow is applied to its use. The first gas flow flows around the housing within the conduit 10 and at an opposite side in order to receive fuel forcedly fed out of the fuel charging chamber.