TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Property: Water vapor modification reactor, burner, water evaporator, carbon monoxide transforming reactor and selective oxidation device have symmetrical shape with respect to center axis (100) of the container.Preferred Arrangement: Water vapor modification reactor, water evaporator, carbon monoxide transforming reactor and selective oxidation device are arranged sequentially from top to bottom in perpendicular direction in the container. The burner is arranged such that upper end of the burner turns into lower end of the water vapor modification reactor. Combustion air supplying line and fuel supplying line are arranged in peripheral region outside the burner in radial direction. Hydrogen manufacturing apparatus further consists of water supplying line (I) (14) and water supplying line (II) (15). The line (I) supplies water from bottom portion of the container, which goes through selective oxidation device and carbon monoxide transforming reactor to water evaporator and cooling. The line (II) supplies water to water evaporator from bottom portion of the container without going through selective oxidation device and carbon monoxide transforming reactor. The combustion gas of a burner raises in central portion of radial direction of water vapor modification reactor, and turns at upper end of the modification reactor and descends through outer side of radial direction of the modification reactor. The combustion gas heats water evaporator, carbon monoxide transforming reactor, selective oxidation device, water supplying line (II), combustion air supplying line and fuel supplying line, while descending through outer side of modification reactor. The combustion gas flow path is subsequently guided to discharge port provided at bottom portion of the container. Hydrogen manufacturing apparatus is further provided with desulfurizer for de-sulfurizing hydrocarbon oil and mixing vessel, in perpendicular direction in the container between water evaporator and carbon monoxide transforming reactor, and also provided with superheater for superheating generated water vapor. Water vapor from the water evaporator and hydrocarbon oil supplied from bottom portion of the container are supplied to the desulfurizer. Desulfurized mixture is supplied to water vapor modification reactor. The desulfurizer is equipped with sorption-type desulfurization catalyst. The mixing vessel is arranged in combustion gas flow path for mixing hydrocarbon oil and water vapor. The mixture from the mixing vessel is supplied to modification reactor. Carbon monoxide transforming reactor consists of low temperature carbon monoxide transforming portion having low rated operating temperature, and high temperature carbon monoxide transforming portion having high rated operating temperature.