Abstract: There are provided a fuel cell capable of preventing gas leakage through a gas channel, and a method for manufacturing a fuel cell that allows production of such a fuel cell in high volume with lower costs while preventing cracking at corners of the gas channel. In a fuel cell, on a support substrate (1) having a gas channel (10) formed inside are laminated a first electrode (2), a solid electrolyte (3), and a second electrode (4) one after another. The support substrate (1) is formed by laminating green tapes containing support substrate material powder and firing the laminate. Fillet portions (S) are formed at corners of the gas channel (10) of the support substrate (1).