FUEL SUPPLY DEVICE

The fuel supply device includes a fuel pump unit having a fuel pump and a support section, and a suction filter which is mounted on a fuel suction section provided at the fuel pump unit and filters fuel that is suctioned into the fuel pump. Then, the suction filter has a connection section which protrudes toward the fuel pump unit and is also coaxially connected to the fuel suction section. At both the fuel pump unit and the connection section, fixing mechanisms are provided which maintain the connection state of the connection section in cooperation with each other in a case where the connection section has been rotated around an axis thereof in a state where the connection section has been connected to the suction section.