Cover for Fuel Tank

A cover for a fuel tank includes a flange unit configured to close an opening of the fuel tank and a joint member connected to the flange unit . The joint member is movable in an upward/downward direction. The flange unit includes a side tubular portion extending in the upward/downward direction . The joint member includes a support column portion extending in the upward/downward direction . The support column portion is movably disposed in the side tubular portion so as to be movable in the upward/downward direction. The support column portion is connected to the side tubular portion by a snap-fit so as to be movable and suspendable in the upward/downward direction.