An engine unit comprising: a V-type engine, on which a front cylinder, a rear cylinder, a front intake port connected to the front cylinder, and a rear intake port connected to the rear cylinder are formed, and a throttle body assembly mounted to the V-type engine, and wherein the throttle body assembly includes a front throttle body (53a, 53b) formed with a front air cylinder (55a, 55b) connected to the front intake port and including a front throttle valve (57a, 57b) for opening and closing of the front air cylinder (55a, 55b), a rear throttle body (54a, 54b) formed with a rear air cylinder (56a, 56b) connected to the rear intake port and including a rear throttle valve (58a, 58b) for opening and closing of the rear air cylinder (56a, 56b), a motor including a rotating shaft, which extends in a width direction, and arranged between the central axis of the front air cylinder (55a, 55b) and the central axis of the rear air cylinder (56a, 56b) in a longitudinal direction to drive the front throttle valve (57a, 57b) and the rear throttle valve (58a, 58b), and characterised in that a fuel supply pipe is arranged between a central axis of the front air cylinder (55a, 55b) and a central axis of the rear air cylinder (56a, 56b) in a longitudinal direction to extend widthwise in a lower position than a higher one of an upper end of the front throttle body (53a, 53b) and an upper end of the rear throttle body (54a, 54b) to supply a fuel to the front air cylinder (55a, 55b) and the rear air cylinder (56a, 56b), and an axis of the rotating shaft of the motor is positioned forwardly or rearwardly of a central axis of the fuel supply pipe. a V-type engine, on which a front cylinder, a rear cylinder, a front intake port connected to the front cylinder, and a rear intake port connected to the rear cylinder are formed, and a throttle body assembly mounted to the V-type engine, and wherein the throttle body assembly includes a front throttle body (53a, 53b) formed with a front air cylinder (55a, 55b) connected to the front intake port and including a front throttle valve (57a, 57b) for opening and closing of the front air cylinder (55a, 55b), a rear throttle body (54a, 54b) formed with a rear air cylinder (56a, 56b) connected to the rear intake port and including a rear throttle valve (58a, 58b) for opening and closing of the rear air cylinder (56a, 56b), a motor including a rotating shaft, which extends in a width direction, and arranged between the central axis of the front air cylinder (55a, 55b) and the central axis of the rear air cylinder (56a, 56b) in a longitudinal direction to drive the front throttle valve (57a, 57b) and the rear throttle valve (58a, 58b), and characterised in that a fuel supply pipe is arranged between a central axis of the front air cylinder (55a, 55b) and a central axis of the rear air cylinder (56a, 56b) in a longitudinal direction to extend widthwise in a lower position than a higher one of an upper end of the front throttle body (53a, 53b) and an upper end of the rear throttle body (54a, 54b) to supply a fuel to the front air cylinder (55a, 55b) and the rear air cylinder (56a, 56b), and an axis of the rotating shaft of the motor is positioned forwardly or rearwardly of a central axis of the fuel supply pipe.