NOVELTY - Fuel cell comprises unit cell (100); cell fixing member comprising flow tube inserted into unit cell to form continuous flow path, fixing tube provided to outside of flow tube to form space for accommodating end portion of unit cell between fixing tube and flow tube, and connecting portion connecting fixing tube and flow tube to each other and to restrict insertion depth of electrolyte layer and first electrode layer; and welding portion fixing and sealing coating layer and inner circumferential surface of fixing tube to each other.    USE - Fuel cell.    ADVANTAGE - The wettability between surface of unit cell and filler-metal used in brazing process is improved using welding portion, thus increasing fixing and sealing ability between unit cell and cell fixing member or between unit cell and cell cap. The fuel cell has secured sealing ability, thus its useful life is extended.    DETAILED DESCRIPTION - Fuel cell comprises unit cell (100) comprising first electrode layer (10) having hollow circular or polygonal cylinder shape, electrolyte layer (20) surrounding outer circumferential surface of first electrode layer, second electrode layer (30) surrounding electrolyte layer while exposing end portion of electrolyte layer, and coating layer (150) formed by coating mixture of ceramic and metal on outer circumferential surface of exposed end portion of electrolyte layer; cell fixing member (200) comprising flow tube (201) inserted into unit cell to form continuous flow path, fixing tube (202) provided to outside of flow tube to form space for accommodating end portion of unit cell between fixing tube and flow tube, and connecting portion (203) connecting fixing tube and flow tube to each other and to restrict insertion depth of electrolyte layer and first electrode layer; and welding portion fixing and sealing coating layer and inner circumferential surface of fixing tube to each other. The coating layer is coated to extend up to bottom of unit cell or to lower inner circumferential surface of unit cell. The electrolyte layer is further interposed between unit cell and extended coating layer. The coating layer is formed into multi-layered structure in which content of metal element is continuously increased from unit cell to welding portion. The coating layer is formed by dip-coating comprising sequentially dipping manufactured unit cell into dip-coating solution; drying dip-coating solution; and repeatedly performing coating and drying processes while increasing content of metal element in dip-coating solution. An INDEPENDENT CLAIM is included for manufacture of fuel cell by manufacturing unit cell; forming coating layer; sintering and reducing coating layer.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of unit cell and cell fixing member.    First electrode layer (10)    Electrolyte layer (20)    Second electrode layer (30)    Unit cell (100)    Coating layer (150)    Cell fixing member (200)    Flow tube (201)    Fixing tube (202)    Connecting portion (203)