Passing type fuel reformer

A passing type fuel reformer characterized by spherical particles having a substantially equal diameter and formed by kneading, granulating, drying, calcining and polishing ceramic powder and radioactive rare-earth mineral ore powder, a cylindrical body covered at opposite ends with lids and formed in the peripheral surface thereof and in the surfaces of the rids with through-holes having a diameter small than that of the spherical particles at a rate of opening area of not less than 50%, the spherical particles being charged in the cylindrical body at a filling rate of not less than 90%, a rigid tube body loosely fitted therein with a fuel reformer body composed of the cylindrical body charged therein with the spherical particles and the lids, a seal member such as an O-ring provided between the outer peripheral surface of the fuel reformer body and the inner surface of the rigid tube body, connectors removably fitted to opposite ends of the rigid tube body, and connection pipes respectively provided to the connectors, which are connected to a fuel pipe laid between a fuel tank and an engine body.