To provide a continuously variable transmission and a control method thereof, allowing for control of the axial position of a movable sheave without a sensor for measuring the axial position of the movable sheave on a rotational shaft and for stable control with the movable sheave being held in position, without the increase in the size of mechanisms and power consumption.
A continuously variable transmission in which, on a rotational shaft 1 thereof are mounted a fixed sheave 2 positioned in the axial direction and a movable sheave 3 slidable axially, so as to face each other, a motor is provided for driving the movable sheave, and a slide driving means 16 is provided for sliding the movable sheave 3 axially by the rotation of the motor, characterized in that: the motor is a step motor 6, and the step motor 6 and the slide drive means 16 are mounted coaxially with the rotational shaft 1.