A throttle control apparatus includes a throttle control sleeve rotatably mounted on a handlebar of a vehicle, a throttle control housing fixed to the handlebar, and a throttle sensor unit housed in the throttle control housing. The throttle sensor unit is operable to detect a rotational angle of the throttle control sleeve. The throttle control housing is rotatably engaged with an outer periphery of the throttle control sleeve. The throttle sensor unit includes a rotary member having a spline hole formed therein, a fixed contact and a movable contact for detecting rotation of the rotary member. The throttle control sleeve and the throttle sensor unit are engaged with each other by spline fitting. A throttle return mechanism and the sensor unit are arranged in an overlapping manner in an axial direction. Handle switches are arranged on a vehicle body center side of the throttle control housing.