To reduce pulsation of fuel pressure and to restrain generation of noise by restarining generation of resonance at a connecting part on a head end of low pressure fuel intake piping.

This fuel supply device is furnished with a fuel tank 1, a low pressure fuel pump 2 in this fuel tank 1, a low pressure fuel intake piping 3 one end part of which is connected to the low pressure fuel pump 2, a first branch piping 150A one end part of which is connected to the other end part of the low pressure fuel intake piping 3, a first high pressure fuel supply device 100A connected to the other end part of the first branch piping 150A and to discharge low pressure fuel by pressurizing it to be high pressure fuel, a second branch piping 150B one end part of which is connected to the other end part of the low pressure fuel intake piping 3 and a second high pressure fuel supply device 100B connected to the other end part of the second branch piping 150B and to discharge low pressure fuel by pressurizing it to be high pressure fuel, and the first branch piping 150A and the second branch piping 150B are constituted of steel pipes.