This invention relates to a stage apparatus including a first stage, a second stage mounted on the first stage, a first actuator which drives the first stage in a first direction, and a second actuator which drives the second stage such that the second stage moves relative to the first stage. The stage apparatus also includes a first unit including a first movable magnet arranged at an end of the first stage in the first direction, and a first stationary magnet which faces the first movable magnet and generates a repulsive force against the first movable magnet. The stage apparatus also includes a second unit including a second movable magnet arranged at the two ends of the second stage in the first direction, and a second stationary magnet which faces the second movable magnet and generates a repulsive force against the second movable magnet.