Provided are a method for manufacturing a fuel cell having high durability against a repeated heat cycling resulting from start and stop operations, as well as a fuel cell. The present invention is amethod for manufacturing a fuel cell provided with at least one solid electrolyte layer and a plurality of electrodes, the method including: a stacking step for stacking the solid electrolyte layer and the electrodes to form a laminated body having the electrodes provided on both surfaces of the solid electrolyte layer (step S1); a first voltage application step for applying a voltage having a first polarity across the electrodes, which face each other with the solid electrolyte layer interposed therebetween (step S2); and a second voltage application step for applying a voltage having a second polarity, which is opposite to the first polarity, across the electrodes, which face each other with the solid electrolyte layer interposed therebetween (step S3).