TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Fuel Cell: The solid oxide fuel cell further comprises: a metal tube whose one end is inserted in an inner circumference of the metal foam and whose the other end is connected with the manifold to electrically connect the metal foam with the manifold, where the metal foam extends from an inside of the unit cell to an outer circumference of the other end of the unit cell. The manifold includes a gas supply unit and a gas discharge unit, the number of the unit cells is two or more, and one end of the unit cell is connected to the gas supply unit and the other end of the unit cell is connected to the gas discharge unit such that the unit cells are connected in parallel to each other. The manifold includes a gas supply unit and a gas discharge unit, the number of the unit cells is two or more, and the other end of the unit cell is connected to the gas supply unit and one end of the unit cell is connected to the gas discharge unit such that the unit cells are connected in parallel to each other. The manifold also includes a gas supply unit, one or more gas communication units and a gas discharge unit, the number of the unit cells is two or more, and one end of one unit cell is connected to the gas supply unit, the other end of another unit cell is connected to the gas discharge unit, and one end and the other end of the two adjacent unit cells are connected to the gas communication unit such that the unit cells are connected in series to each other. The manifold includes a gas supply unit, one or more gas communication units and a gas discharge unit, the number of the unit cells is two or more, and the other end of one unit cell is connected to the gas supply unit, one end of another unit cell is connected to the gas discharge unit, and one end and the other end of the two adjacent unit cells are connected to the gas communication unit such that the unit cells are connected in series to each other. The unit cell includes an anode tubular support as the ceramic tubular support, and the anode tubular support is sequentially provided on an outer circumference with an electrolyte and a cathode, so that the metal layer collects positive current and the metal foam collects negative current, and the manifold supplies fuel into the anode tubular support. The cathode formed at the other end of the unit cell is removed, and the other end of the unit cell is connected with the manifold through brazing using a metal filler. The unit cell includes a cathode tubular support as the ceramic tubular support, and the cathode tubular support is sequentially provided on an outer circumference with an electrolyte and an anode, so that the metal layer collects negative current and the metal foam collects positive current, and the manifold supplies air or oxygen into the cathode tubular support. The anode formed at the other end of the unit cell is removed, and the other end of the unit cell is connected with the manifold through brazing using a metal filler. The other end of the unit cell is connected with the manifold through brazing using a metal filler. The metal tube is made of stainless steel or a porous material. Only one end of the metal tube, inserted in the inner circumference of the metal foam, is selectively made of a porous material.