To suppress the reduction of the reaction efficiency of a fuel reformer, that is caused by inclusion of dew condensation water into oxidation air supplied into the reformer.

The fuel reforming system is equipped with a reformer (30) for reforming a raw fuel into a hydrogen-enriched fuel gas, an air compressor (12) for supplying compressed air into the reformer (30), and a gas-liquid separation means (14) for separating the compressed air supplied to the reformer (30) from the air compressor (12) into gas and liquid. Mixing of moisture into the reformer (30) is suppressed and the reduction of the reaction efficiency in the reformer (30) can be avoided by performing gas-liquid separation of the moisture, such as the dew condensation water, contained in the compressed air supplied from the air compressor (12) by the gas-liquid separation means (14).