To provide a fuel supply pipe having excellent assemblability with respect to an internal combustion engine and excellent exchangeability, capable of facilitating attachment or replacement of a fuel injection valve.

The fuel supply pipe 5 is used in the engine (internal combustion engine) having cylinders S each provided with two intake valves and two injectors (fuel injection valves) 4 respectively corresponding to the intake valves. The fuel supply pipe 5 comprises a first fuel supply pipe 6 and a second fuel supply pipe 7. The injector 4 corresponding to one of the intake valves of each of the cylinders S1 to S4 is attached to the first fuel supply pipe 6, and the injector 4 corresponding to the other of the intake valves of each of the cylinders S1 to S4 are attached to the second fuel supply pipe 7. The first fuel supply pipe 6 and the second fuel supply pipe 7 are constituted in such a manner that they can be combined so that all the injectors 4 are arranged substantially linearly.