A hydrogen generation device comprising: a reformer for generating a hydrogen-containing gas using a raw material; a first desulfurization unit for adsorbing and desulfurizing a sulfur compound from the raw material supplied to the reformer; a second desulfurization unit for hydrodesulfurizing the sulfur compound from the raw material supplied to the reformer; a first path used to supply the raw material to the reformer through at least the first desulfurization unit; a second path used to supply the raw material to the reformer through only the second desulfurization unit of the first desulfurization unit and the second desulfurization unit; a switch unit for performing switching between the first path and the second path; a third path used to supply the hydrogen-containing gas generated in the reformer to the second desulfurization unit; a flow control unit which selectively enables or inhibits a flow of the hydrogen-containing gas from an upstream end of the third path toward a downstream end of the third path; and a controller adapted to execute predetermined processing in such a manner that, in at least either a time point before generation of the hydrogen-containing gas is stopped or start-up, and in a state in which the reformer is generating the hydrogen-containing gas, the switch unit is adapted to perform switching to select the first path and the flow control unit is adapted to enable the flow of the hydrogen-containing gas, wherein in the predetermined processing, the controller is adapted to control the flow control unit to initiate the flow of the hydrogen-containing gas when a temperature of the third path reaches a value which is equal to or higher than a temperature at which water condensation in the third path does not occur. a reformer for generating a hydrogen-containing gas using a raw material; a first desulfurization unit for adsorbing and desulfurizing a sulfur compound from the raw material supplied to the reformer; a second desulfurization unit for hydrodesulfurizing the sulfur compound from the raw material supplied to the reformer; a first path used to supply the raw material to the reformer through at least the first desulfurization unit; a second path used to supply the raw material to the reformer through only the second desulfurization unit of the first desulfurization unit and the second desulfurization unit; a switch unit for performing switching between the first path and the second path; a third path used to supply the hydrogen-containing gas generated in the reformer to the second desulfurization unit; a flow control unit which selectively enables or inhibits a flow of the hydrogen-containing gas from an upstream end of the third path toward a downstream end of the third path; and a controller adapted to execute predetermined processing in such a manner that, in at least either a time point before generation of the hydrogen-containing gas is stopped or start-up, and in a state in which the reformer is generating the hydrogen-containing gas, the switch unit is adapted to perform switching to select the first path and the flow control unit is adapted to enable the flow of the hydrogen-containing gas, wherein in the predetermined processing, the controller is adapted to control the flow control unit to initiate the flow of the hydrogen-containing gas when a temperature of the third path reaches a value which is equal to or higher than a temperature at which water condensation in the third path does not occur. <EOS>