A solid electrolytic fuel battery comprising: a battery structure part including a plurality of cells each having an anode, a solid electrolyte, and a cathode; a support structure comprising a cell separation part arranged between the plurality of cells, and formed of a material containing ceramics; and a gas supply path structure part having an anode gas supply path to supply an anode gas to each of the cells, and a cathode gas supply path to supply a cathode gas to each of the cells, each of the anode gas supply path and the cathode gas supply path comprising an elongate opening, wherein either within each of the cells, the anode is formed of first and second adjacent anode layers (11a, 11b), and the cathode is formed of first and second adjacent cathode layers (13a, 13b), the anode and cathode being separated by the solid electrolyte with the solid electrolyte being interposed in between, and the cathode gas supply path is interposed between two adjacent cathode layers (13a, 13b) in the cathode so that the cathode gas supply path is in contact with a side surface of both cathode layers (13a,13b) on one side, and the anode gas supply path has first and second anode gas supply paths (23a,23b), wherein the first anode gas supply path is arranged so that it is in contact with a side surface of the first anode layer, and the second anode gas supply path is arranged so that it is in contact with a side surface of the second anode layer, or within each of the cells the anode is formed of four adjacent anode layers (11a, 11b, 11c and 11d), and the cathode is formed of four cathode layers (13a, 13b, 13c and 13d), the anode and cathode being separated by the solid electrolyte with the solid electrolyte being interposed in between, and the cathode gas supply path has first and second cathode gas supply paths (24a,24b) which are interposed between respective pairs of the four adjacent cathode layers (13a, 13b, 13c and 13d) in the cathode, so that the first cathode gas supply path is in contact with a side surface of each of one respective pair of the cathode layers (13a, 13b) and the second cathode gas supply path is in contact with a side surface of each of the second respective pair the cathode layers (13c, 13d), and the anode gas supply path has first and second anode gas supply paths (23a,23b) which are interposed between respective pairs of the four adjacent anode layers (11a, 11b, 11c and 11d) in the anode, so that the first anode gas supply path is in contact with a side surface of each of one respective pair of the anode layers (11a, 11b) and the second anode gas supply path is in contact with a side surface of each of the second respective pair of the anode layers (11c, 11d). a battery structure part including a plurality of cells each having an anode, a solid electrolyte, and a cathode; a support structure comprising a cell separation part arranged between the plurality of cells, and formed of a material containing ceramics; and a gas supply path structure part having an anode gas supply path to supply an anode gas to each of the cells, and a cathode gas supply path to supply a cathode gas to each of the cells, each of the anode gas supply path and the cathode gas supply path comprising an elongate opening, wherein either within each of the cells, the anode is formed of first and second adjacent anode layers (11a, 11b), and the cathode is formed of first and second adjacent cathode layers (13a, 13b), the anode and cathode being separated by the solid electrolyte with the solid electrolyte being interposed in between, and the cathode gas supply path is interposed between two adjacent cathode layers (13a, 13b) in the cathode so that the cathode gas supply path is in contact with a side surface of both cathode layers (13a,13b) on one side, and the anode gas supply path has first and second anode gas supply paths (23a,23b), wherein the first anode gas supply path is arranged so that it is in contact with a side surface of the first anode layer, and the second anode gas supply path is arranged so that it is in contact with a side surface of the second anode layer, or within each of the cells the anode is formed of four adjacent anode layers (11a, 11b, 11c and 11d), and the cathode is formed of four cathode layers (13a, 13b, 13c and 13d), the anode and cathode being separated by the solid electrolyte with the solid electrolyte being interposed in between, and the cathode gas supply path has first and second cathode gas supply paths (24a,24b) which are interposed between respective pairs of the four adjacent cathode layers (13a, 13b, 13c and 13d) in the cathode, so that the first cathode gas supply path is in contact with a side surface of each of one respective pair of the cathode layers (13a, 13b) and the second cathode gas supply path is in contact with a side surface of each of the second respective pair the cathode layers (13c, 13d), and the anode gas supply path has first and second anode gas supply paths (23a,23b) which are interposed between respective pairs of the four adjacent anode layers (11a, 11b, 11c and 11d) in the anode, so that the first anode gas supply path is in contact with a side surface of each of one respective pair of the anode layers (11a, 11b) and the second anode gas supply path is in contact with a side surface of each of the second respective pair of the anode layers (11c, 11d).