FUEL CELL DEVICE

PROBLEM TO BE SOLVED: To provide a fuel cell device that is improved in certainty of detection of the end of the lifetime of a filter.SOLUTION: The fuel cell device includes: a fuel cell stack which generates electric power through reaction between hydrogen and oxygen and discharges gas containing steam; a condensation portion which condenses the steam by cooling the gas to generate condensed water; a clean water supply portion which supplies clean water; a tank in which the condensed water generated by the condensation portion and the clean water supplied from the clean water supply portion are put together and reserved as material water; the filter which purifies the material water, a conductivity measurement portion which measures the conductivity of the material water having passed through the filter; a first detection portion which detects the filter having its day based upon a measurement result of the conductivity measurement portion; a supply amount measurement portion which measures the supply amount of the clean water supplied from the clean water supply portion; and a second detection portion which detects the filter having its day based upon a measurement result of the supply amount measurement portion.