A throttle device mounted on an engine having a plurality of intake ports, the throttle device comprising: a plurality of throttle bodies (11a, 11b) having intake passages (12a, 12b) formed therein; a plurality of throttle valves (13a, 13b) provided so as to control a degree of opening in the intake passages (12a, 12b); a throttle shaft supporting the throttle valves (13a, 13b); an actuator that drives the throttle valves (13a, 13b) to open and close through the throttle shaft; a rotation transmission mechanism interposed between the actuator and the throttle shaft; and a position sensor that detects a displacement in the rotation transmission mechanism, wherein the rotation transmission mechanism includes a first transmission member driven by the actuator and a second transmission member capable of interlocking with the first transmission member and is integrally connected to the throttle shaft in a rotation direction, the position sensor, that detects the displacement of the second transmission member, and the rotation transmission mechanism are disposed between the plurality of throttle bodies (11a, 11b), the plurality of throttle bodies (11a, 11b) include a first throttle body having a first intake passage and a second throttle body having a second intake passage and having an accommodation portion for accommodating the actuator, the throttle device has the position sensor between the first intake passage and the second intake passage, and the position sensor is constituted by a movable side detecting element supported by the second transmission member and a fixed side detecting element, characterized in that the fixed side detecting element is arranged on an accommodation cover in which the rotation transmission mechanism is accommodated, the movable side detection element is disposed on a surface of the second transmission member, the surface extending in a radial direction of the throttle shaft and opposed to an accommodation cover covering the rotation transmission mechanism on one side, and the fixed side detection element is disposed on the accommodation cover. a plurality of throttle bodies (11a, 11b) having intake passages (12a, 12b) formed therein; a plurality of throttle valves (13a, 13b) provided so as to control a degree of opening in the intake passages (12a, 12b); a throttle shaft supporting the throttle valves (13a, 13b); an actuator that drives the throttle valves (13a, 13b) to open and close through the throttle shaft; a rotation transmission mechanism interposed between the actuator and the throttle shaft; and a position sensor that detects a displacement in the rotation transmission mechanism, wherein the rotation transmission mechanism includes a first transmission member driven by the actuator and a second transmission member capable of interlocking with the first transmission member and is integrally connected to the throttle shaft in a rotation direction, the position sensor, that detects the displacement of the second transmission member, and the rotation transmission mechanism are disposed between the plurality of throttle bodies (11a, 11b), the plurality of throttle bodies (11a, 11b) include a first throttle body having a first intake passage and a second throttle body having a second intake passage and having an accommodation portion for accommodating the actuator, the throttle device has the position sensor between the first intake passage and the second intake passage, and the position sensor is constituted by a movable side detecting element supported by the second transmission member and a fixed side detecting element, characterized in that the fixed side detecting element is arranged on an accommodation cover in which the rotation transmission mechanism is accommodated, the movable side detection element is disposed on a surface of the second transmission member, the surface extending in a radial direction of the throttle shaft and opposed to an accommodation cover covering the rotation transmission mechanism on one side, and the fixed side detection element is disposed on the accommodation cover.