Abstract: A hydrogen generating device for generating a gas containing hydrogen by decomposing a fuel containing an organic compound which includes a partition membrane, a fuel electrode provided on one surface of the partition membrane, a fuel supply unit supplying a fuel containing organic compound and water to the fuel electrode, an oxidizing electrode provided on the other surface of the partition membrane, an oxidizing agent supply unit supplying an oxidizing agent to the oxidizing electrode, and a gas generating and collecting unit generating and collecting the gas containing hydrogen from the fuel electrode. A low oxidizing agent supply region where supply of the oxidizing agent is substantially lower than the other region is present on an oxidizing electrode side of the hydrogen generating device.