Patent ID: 7923161

Claim:
A fuel cell system comprising: a fuel cell mounted in a movable body; external connecting means connecting said movable body to an external power source provided outside said movable body; connection determining means determining whether or not said movable body is connected to said external power source via said external connecting means by detecting a resistance via said external connecting means; an auxiliary machine unit utilized for maintaining and managing an operating environment of said fuel cell; and power supply control means that controls a supply of electric power to said auxiliary machine unit from said fuel cell and said external power source, wherein: said power supply control means includes connection switching means that switches over a state between said external connecting means and said auxiliary machine unit to a connected state or a disconnected state, and said connection determining means determines whether said external power source is connected to said external connecting means or not when a connection between said external connecting means and said auxiliary machine unit is disconnected by said connection switching means.