A fuel-level measuring apparatus measures the level of fuel in a vehicle fuel tank. The apparatus can ensure a sufficient capacity of the fuel tank and sense the fuel level even when the fuel tank has a thin or complicated shape. A fuel-level measuring apparatus that senses the level of fuel in a vehicle fuel tank disposed below a floor panel of a vehicle includes a tank band that secures the fuel tank to a body of the vehicle, and a strain gauge attached to the tank band. The fuel level can be obtained from strain in the tank band detected by the strain gauge.