A hydrogen production system comprising: a vaporizer that heats a mixed material containing a hydrocarbon-based material, water and oxygen for vaporizing the mixed material; a ref orming reactor that causes both a steam ref orming reaction of the hydrocarbon-based material and a partial oxidation reaction of the hydrocarbon-based material at a time, thereby generating reformed gas containing hydrogen out of the vaporized mixed material; and a pressure-swing adsorption gas separation apparatus which comprises an adsorption tower loaded with an adsorbing agent wherein the apparatus can separate the reformed gas into a hydrogen-rich gas and a hydrogen-containing desorbed gas; wherein the vaporizer can burn the hydrogen-containing desorbed gas to heat the mixed material utilizing a combustion gas, as a heat source, that is generated through the burning of the hydrogen-containing desorbed gas; wherein the vaporizer includes amain container, a flow tube that allows the mixed material to flow therein, installed through inside the main container, and a catalyst combustion unit that can execute catalytic combustion of the hydrogen-containing desorbed gas to supply the combustion gas to the main container; wherein a supply tube is provided that has a double-tube structure which includes an outer tube that can supply air to the vaporizer and an inner tube that can supply the hydrogen-containing desorbed gas from the pressure-swing adsorption gas separation apparatus to the vaporizer, wherein a heat storage material is loaded around the supplytube and the flow tube inside the main container, and wherein the catalyst combustion unit is located at an inner lower end portion of the outer tube in the supply tube, and the flow tube has a spiral shape and surrounds the supply tube. a vaporizer that heats a mixed material containing a hydrocarbon-based material, water and oxygen for vaporizing the mixed material; a ref orming reactor that causes both a steam ref orming reaction of the hydrocarbon-based material and a partial oxidation reaction of the hydrocarbon-based material at a time, thereby generating reformed gas containing hydrogen out of the vaporized mixed material; and a pressure-swing adsorption gas separation apparatus which comprises an adsorption tower loaded with an adsorbing agent wherein the apparatus can separate the reformed gas into a hydrogen-rich gas and a hydrogen-containing desorbed gas; wherein the vaporizer can burn the hydrogen-containing desorbed gas to heat the mixed material utilizing a combustion gas, as a heat source, that is generated through the burning of the hydrogen-containing desorbed gas; wherein the vaporizer includes amain container, a flow tube that allows the mixed material to flow therein, installed through inside the main container, and a catalyst combustion unit that can execute catalytic combustion of the hydrogen-containing desorbed gas to supply the combustion gas to the main container; wherein a supply tube is provided that has a double-tube structure which includes an outer tube that can supply air to the vaporizer and an inner tube that can supply the hydrogen-containing desorbed gas from the pressure-swing adsorption gas separation apparatus to the vaporizer, wherein a heat storage material is loaded around the supplytube and the flow tube inside the main container, and wherein the catalyst combustion unit is located at an inner lower end portion of the outer tube in the supply tube, and the flow tube has a spiral shape and surrounds the supply tube.