To simplify fuel piping for connecting a fuel distribution pipe and a fuel pump in a throttle body comprising two fuel injection valves, a fuel supply pipe F comprises a first fuel supply pipe 1 having a fuel flow-in passage 1b projected from a first cylindrical portion 1a, a first inserting pipe 1c projected in one side direction x, a fuel flow-in passage 1d, and a first fuel supply passage, a second fuel supply pipe 2 having a second insert pipe 2b projected in the direction X from a second cylindrical portion 2a and fuel supply passage 2c, and a fuel connecting pipe 3 connecting the fuel flow-in passage 1d and the second fuel supply passage 2c, and the first and second inserting pipes 1c, 2b are inserted into first and second inserting holes 6d, 7d opened toward another side direction Y from a second fuel distribution pipe 7 respectively.