A fuel reservoir for a fuel cell detachably connected with a fuel cell main body is constituted from a fuel storing vessel of a tube type for storing a liquid fuel, a fuel discharge part and a follower which seals the liquid fuel and moves as the liquid fuel is consumed at the rear end of the liquid fuel. The inside of the fuel storing vessel includes a fuel storing chamber at least hermetically sealed with the follower and a pressurizing chamber filled with a means for pressing the follower staying in a state in which it is completely separated from the ambient air and hermetically sealed. The fuel reservoir for a fuel cell makes it possible to prevent boiling, bubbling and spouting of the liquid fuel and to stably supply the liquid fuel directly to a fuel cell main body.