Fuel supply device

A fuel supply device to be arranged on a bottom of a fuel tank comprising:

• a sub-tank to be fixed on the bottom of the fuel tank, the sub-tank temporarily storing fuel in the fuel tank, an upper side of the sub-tank having an opening;
• a bracket attached to an opening side of the sub-tank;
• an electric pump that pumps up the fuel in the sub-tank and supplies the fuel to outside of the sub-tank;
• and
• a plurality of fitting portions arranged on an outer edge of the bracket and to fix the bracket to the sub-tank by being fitted to a plurality of receiving portions arranged on the opening of the sub-tank, wherein
• the bracket has
• a lid covering the opening with a predetermined separation distance from the opening of the sub-tank when the bracket is attached to the opening of the sub-tank,
• a fixing portion that fixes the electric pump,
• a plurality of damping portions having predetermined damping characteristics, the damping portion being provided between the fixing portion and the fitting portions, and
• the plurality of damping portions are set to have damping coefficients, respectively, such that a resonance frequency of a component to fix the electric pump to the bracket is between a third oscillation frequency accompanied by a rotation of the electric pump and an eighth oscillation frequency of the electric pump.