Fuel supply device

A fuel supply device that supplies fuel to an internal-combustion engine from a fuel tank for a vehicle, the fuel supply device comprising:

• a cover to be attached to an upper wall of the fuel tank;
• a pump unit to be disposed on a bottom wall of the fuel tank to pump fuel from the fuel tank toward the internal-combustion engine;
• and
• a connecting strut that connects the cover and the pump unit with each other,
• the pump unit includes
• a unit body supported by the connecting strut in a radial direction and a thrust direction, and
• a fuel pump arranged on the unit body to pump fuel drawn from the fuel tank toward the internal-combustion engine, the center of gravity of the fuel pump being located offset toward the connecting strut than a width center of a width of the unit body, the width being defined from a thrust support part where the unit body is supported by the connecting strut to an end part of the unit body opposite from the connecting strut in a specific transverse direction, wherein:
• a subtank is provided on the unit body, and has an inner space to store fuel to be drawn by the fuel pump from the fuel tank,
• the subtank has an enlarging part that enlarges the inner space, and
• the enlarging part is projected in a remaining space that remains around the fuel pump, on a side opposite from the connecting strut through the width center of the width of the unit body in the specific transverse direction.