PURPOSE: To provide a fuel reformer suitable for on-vehicle fuel cell generating equipment where the powering of a reformer catalyst filled into a reforming pipe by vibration, etc., applied from the outside is properly decreased.

CONSTITUTION: In a fuel reformer for on-vehicle fuel cell generating equipment where a reformer pipe 3 packed with a reformer catalyst 4 is housed in the furnace of a furnace body 1 equipped with a burner 2 and feed fuel gas is introduced into the reformer pipe 3 to get hydrogen-rich reformed gas, the inside of the reformer pipe 3 is divided into plural sections along the gas passage and a cushion material 5 with gas permeability, such as steel wool is inserted between the reforming catalyst layers for each section. At the same time, compression springs 6 are incorporated into the pipe ends as a stopper means for pressurizing and holding the reforming catalyst 4 in the pipe and under the assembled conditions, vibration force applied from the outside to the reforming catalyst 4 is adsorbed by the cushion material to prevent the catalyst from powdering.