A fuel container includes a container body (2) having a fuel discharge port and an interior spacing. A body of liquid fuel is filled in the interior spacing of the container body. Follower units are provided in the container body, in contact with at least a part of an end of the body of the liquid fuel. Solid follower auxiliary members (75 to 78) are interposed between the follower units and the body of liquid fuel to be optically detectable.
