plug 10 is inserted into the tubular body 2 from the end part thereof on the opposite side to the end part wherein the fuel outlet 12 of the tubular body 2 is formed a heating part of the heating plug 10 is disposed in an extension in the longitudinal direction inside the hollow tubular part of the open cellular member 3 the fuel passage 8 formed between the tubular body 2 and the heating plug 10 ends in front of the fore end of the heating plug 10 that is inserted into the tubular body 2 and communicates with a single hole fuel passage 16 of the fuel injection pipe 6 through the end part 4 of the open cellular member 3 to the fuel feed port 14 of the tubular body 2 a fuel feed pipe 9 is joined for feeding the liquid fuel to the fuel passage 8 accordingly the fuel fed through the fuel feed pipe 9 is supplied directly to the fuel passage 8 through the fuel feed port 14 of the tubular body 2 and the fuel feed port 17 of the open cellular member 3 in this liquid fuel vaporizing apparatus 1 the inner peripheral surface of the tubular body 2 wherein the end part 4 of the open cellular member 3 is disposed is positioned normally in a part wherein the heat easiest to receive from the outside i e the combustion chamber of the combustion unit the fuel flowing through the open cellular member 3 is always put in a state of passing.