FUEL TANK FUEL FILLER STRUCTURE

To obtain a fuel tank fuel filler structure with which even a fuel nozzle having a large diameter portion can be inserted easily into a fuel fill inlet and which can highly demonstrate the action of guiding the fuel nozzle to the fuel fill inlet. One end of a guide plate (44) is rotatably supported on a rotational shaft (42) disposed on a flapper valve (20). The guide plate (44) is biased by a guide plate biasing spring toward a withdrawal region in which the guide plate withdraws from a passage region of a fuel nozzle. In a state where the flapper valve (20) is in an open position (HP), the entire guide plate (44) is positioned in the withdrawal region. In a state where the flapper valve (20) is in a closed position (TP), the guide plate (44) can be placed near a fuel fill inlet (26).