The throttle control device of this invention for controlling a throttle based on outputs of a position sensor including a first sensor and a second sensor which detect a position of a same object includes: a judgment section for judging whether or not the position sensor is abnormal by comparing a difference between the output of the first sensor and the output of the second sensor with a predetermined threshold value; and a change section for changing the predetermined threshold value depending on at least one of the output of the first sensor and the output of the second sensor.