An improved fuel supply pipe in a multiple throttle body comprising two fuel injection valves comprises a first fuel supply pipe 1 having a first one side inserting pipe 1c, a first another side inserting pipe 1d and a fuel flow-in pipe 1b, a second fuel supply pipe 2 having a second one side inserting pipe 2b and a second another side inserting pipe 2c and a fuel connection pipe 3 for connecting these pipes 1 and 2, a first one side inserting pipe 1c is inserted into one side first inserting hole 10c, a second one side inserting pipe 2d is inserted into one side second inserting hole 11c, a first another side inserting pipe 1d is inserted into another side first inserting hole 12c, and a second another side inserting pipe 2c is inserted into another side second inserting hole 13c.