FUEL CELL STACK, FUEL CELL SYSTEM, AND METHOD FOR PRODUCING FUEL CELL STACK

The technique of the invention prepares a thin electrolyte layer without causing cracks. An electrolyte membrane (30) includes a dense inorganic electrolyte layer (36) formed on a dense base member (31). Each unit fuel cell includes the electrolyte membrane (30), a fuel electrode (34), and an oxygen electrode (38). Multiple unit fuel cells are laminated in series to complete a fuel cell stack.