To reduce the size of apparatus by designing it so that it can generate a hydrogen-containing gas and separate hydrogen at the same time, and to shift the equilibrium of hydrogen generation reaction to a generation side to decrease the reaction temperature and to make it possible to change the selectivity of a product.

A plurality of hydrogen-containing gas generation bodies 30 and a plurality of hydrogen permeation bodies 40 for permeating hydrogen gas are opposed to each other on both sides of a gas stream path for a fuel gas flowing from the outside.