PURPOSE: To produce stable fuel-air mixture, in a liquid fuel combustion device to burn fuel-air mixture of liquid fuel.

CONSTITUTION: A liquid fuel combustion device comprises a vaporization cylinder 2 with a bottom, a vaporization body 22 heated by a heater 21, a number of protrusion pins 23 formed integrally with the vaporization body 22, a fuel feed means 3 to feed fuel to the vaporization cylinder 2, and a combustion air feed means 4. Vaporization/evaporation are momentarily completed in a way that the protrusion pins 23 are formed on the bottom of the vaporization cylinder 2 and liquid fuel and combustion air are fed to the protrusion pins 23 by which a vaporization load is reduced. As a result, stable vaporization and uniform fuel-air mixture are provided.