A hydrogen generation apparatus, comprising: a hydro-desulfurizer configured to cause a sulfur compound in a feedstock gas to react with hydrogen to remove the sulfur compound; a feedstock supply device configured to raise a pressure of the feedstock gas and supplies the feedstock gas to the hydro-desulfurizer; a feedstock supply flow path that is provided between the feedstock supply device and the hydro-desulfurizer; a reformer configured to generate a hydrogen-containing gas by using a feedstock gas that passes through the hydro-desulfurizer; a hydrogen-containing gas flow path through which the hydrogen-containing gas is discharged from the reformer; a recycle gas flow path that diverges a part of the hydrogen-containing gas, which is discharged from the reformer, from the hydrogen-containing gas flow path to mix the hydrogen-containing gas with a feedstock gas that flows into the feedstock supply flow path; an ejector that is disposed at a joint portion between the feedstock supply flow path and the recycle gas flow path; an on-off valve that is provided to the recycle gas flow path; and an abnormality detection unit (9, 10) configured to detect abnormality when the hydrogen-containing gas is not normally supplied to the hydro-desulfurizer through the recycle gas flow path, wherein the abnormality detection unit (9, 10) is configured to detect the abnormality when the hydrogen-containing gas is not normally supplied to the hydro-desulfurizer through the recycle gas flow path on the basis of a pressure of the feedstock supply flow path or a pressure of the recycle gas flow path downstream of the on-off valve. a hydro-desulfurizer configured to cause a sulfur compound in a feedstock gas to react with hydrogen to remove the sulfur compound; a feedstock supply device configured to raise a pressure of the feedstock gas and supplies the feedstock gas to the hydro-desulfurizer; a feedstock supply flow path that is provided between the feedstock supply device and the hydro-desulfurizer; a reformer configured to generate a hydrogen-containing gas by using a feedstock gas that passes through the hydro-desulfurizer; a hydrogen-containing gas flow path through which the hydrogen-containing gas is discharged from the reformer; a recycle gas flow path that diverges a part of the hydrogen-containing gas, which is discharged from the reformer, from the hydrogen-containing gas flow path to mix the hydrogen-containing gas with a feedstock gas that flows into the feedstock supply flow path; an ejector that is disposed at a joint portion between the feedstock supply flow path and the recycle gas flow path; an on-off valve that is provided to the recycle gas flow path; and an abnormality detection unit (9, 10) configured to detect abnormality when the hydrogen-containing gas is not normally supplied to the hydro-desulfurizer through the recycle gas flow path, wherein the abnormality detection unit (9, 10) is configured to detect the abnormality when the hydrogen-containing gas is not normally supplied to the hydro-desulfurizer through the recycle gas flow path on the basis of a pressure of the feedstock supply flow path or a pressure of the recycle gas flow path downstream of the on-off valve.