A solid oxide fuel cell stack comprising an upper plate, a lower plate spaced from the upper plate, and a unit cell stacking structure disposed between the upper plate and the lower plate, wherein the unit cell stacking structure comprises: a unit cell of a solid oxide fuel cell; a cell frame configured to support an edge portion of the unit cell; an interconnecting member disposed under the cell frame and electrically connected with the unit cell, the cell frame and the interconnecting member having a plurality of corners; a sealing member disposed between the cell frame and the interconnecting member and formed of a glass material or a complex material glass and ceramic; and a spacer member comprising a plurality of corner spacers disposed to be adjacent to the plurality of corners of the cell frame and the interconnecting member, respectively, disposed between the cell frame and the interconnecting member and adjacent to the sealing member, and formed of a mica or an insulating ceramic which has a transition temperature greater than that of the material of the sealing member, and configured to uniformly maintain an interval between the cell frame and the interconnecting member; and a fastening member comprises a bolt passing through the upper plate, the unit cell stacking structure, and the lower plate, a nut (1431, 1432) fastened to one end of the bolt, a washer (1421, 1422) disposed between the nut and the upper plate or between the nut and the lower plate and formed of a material having a greater thermal expansion coefficient than that of the bolt, the fastening member further comprises a tubular material disposed within a through hole which is formed in a stack of the upper plate, the unit cell stacking structure, and the lower plate, and formed of an insulating material, wherein the bolt passes through the tubular material and characterized in that a length of the tubular material is greater than a height of the unit cell stacking structure and smaller than or the same as an entire height of the stack of the upper plate, the unit cell stacking structure, and the lower plate. a unit cell of a solid oxide fuel cell; a cell frame configured to support an edge portion of the unit cell; an interconnecting member disposed under the cell frame and electrically connected with the unit cell, the cell frame and the interconnecting member having a plurality of corners; a sealing member disposed between the cell frame and the interconnecting member and formed of a glass material or a complex material glass and ceramic; and a spacer member comprising a plurality of corner spacers disposed to be adjacent to the plurality of corners of the cell frame and the interconnecting member, respectively, disposed between the cell frame and the interconnecting member and adjacent to the sealing member, and formed of a mica or an insulating ceramic which has a transition temperature greater than that of the material of the sealing member, and configured to uniformly maintain an interval between the cell frame and the interconnecting member; and a fastening member comprises a bolt passing through the upper plate, the unit cell stacking structure, and the lower plate, a nut (1431, 1432) fastened to one end of the bolt, a washer (1421, 1422) disposed between the nut and the upper plate or between the nut and the lower plate and formed of a material having a greater thermal expansion coefficient than that of the bolt, the fastening member further comprises a tubular material disposed within a through hole which is formed in a stack of the upper plate, the unit cell stacking structure, and the lower plate, and formed of an insulating material, wherein the bolt passes through the tubular material and characterized in that a length of the tubular material is greater than a height of the unit cell stacking structure and smaller than or the same as an entire height of the stack of the upper plate, the unit cell stacking structure, and the lower plate.