A fuel cell vehicle includes a fuel tank module that accommodates a fuel gas, and a rail arranged along a vehicle-width direction of the fuel cell vehicle in a floor part of the fuel cell vehicle, in which the fuel tank module includes a casing that accommodates a fuel tank accommodating the fuel gas, a block unit arranged in a bottom surface of the casing and configured to be attachable to and detachable from the rail and movable along the rail, and a fixation unit that can fix the block unit to the rail and release fixation of the block unit to the rail.