Abstract: Provided is a throttle device including a total of two throttle units in each two cylinders in an engine 1, each of the throttle units having a unit body having intake air passages corresponding to four cylinders of the engine, a throttle shaft rotatably supported by the unit body, throttle valves secured to the throttle shaft to open and close the intake air passages for the cylinders, a motor, and a deceleration mechanism decelerating rotation of a drive shaft of the motor and transmitting the decelerated rotation to the throttle shaft, in which a deceleration ratio of the deceleration mechanism provided in a first throttle unit and a deceleration ratio of the deceleration mechanism provided in a second throttle unit out of the two throttle units are different from each other.