Fuel cell system, electrical apparatus and method for recovering water formed in fuel cell system

A fuel cell system includes a fuel-cell power generation part (50) containing a fuel electrode (55), a solid electrolyte (54) and an air electrode (53), and a heat-exchange chamber (110) configured to cool a gas emitted from the fuel-cell power generation part (50) to thereby form water. A power generation reaction using a fuel yields electric power and water in the fuel-cell power generation part (50). The electric power is utilized as driving force typically for an electrical apparatus. A gas containing the water as vapor undergoes heat exchange and condensation to thereby form water in the heat-exchange chamber. The formed water remains inside the heat-exchange chamber (110) without leaking out. The fuel cell system is free from deteriorated performance and uncomfortable feeling in use and can easily and reliably recover the water.