In this vehicle system equipped with a fuel cell, an external power source is connected to a power supply line, to which a fuel cell is connected and which performs input/output of power to/from a vehicle battery, and an insulation inspection of the power supply line is performed before charging the vehicle battery. The vehicle system is provided with an insulation inspection unit, which performsan insulation inspection of the power supply line, a switch, which connects and isolates the fuel cell to/from the power supply line, and a control unit, which can control the connection and isolationof the vehicle battery to/from the power supply line and can control the switch. The control unit isolates the vehicle battery from the power supply line and drives the insulation inspection unit after controlling the switch to isolate the fuel cell from the power supply line.