To provide a technology for suppressing uneven supply of a fluid from a fluid passage having bent parts in a fuel reformer for producing hydrogen from a fuel to be reformed.

The invention is for a fuel reformer which produces hydrogen from a fuel to be reformed. The fuel reformer is provided with a reaction part, and the fluid passage which is for supplying a fluid and has bent parts to bend the advancing direction of the fluid. The bent parts are characterised by being provided with flow velocity dispersion suppressing parts for suppressing the dispersion of the flow velocity of components in the fluid supply direction.