A hydrogen generation apparatus 1 includes a raw material supply unit 4 for controlling a flow rate of a raw material to be supplied from an external element and containing hydrocarbon and an odorizing component; an odorizing component removing section 5 containing an adsorbing agent for adsorbing the odorizing component contained in the raw material; a combustor 2 for combusting the raw material; a reformer 30 for generating hydrogen-containing gas from the raw material which has passed the odorizing component removing section 5 by a reforming reaction using combustion heat supplied from the combustor 2; and a controller 16 for controlling the raw material supply unit to, during driving after the adsorbing agent or the odorizing component removing section 5 is exchanged or after the adsorbing agent is regenerated, makes the flow rate of the raw material to be supplied from the external element higher than the flow rate during the driving immediately before the exchange or regeneration.