An alignment stage apparatus including a base structure and a movable
stage, which can move along a surface of the base structure so as not to
be in contact with the base structure. The apparatus includes a plurality
of power transmission coils buried under the surface of the base
structure, a power reception coil attached to the movable stage to oppose
the surface, a switch unit configured to sequentially switch, of the
plurality of power transmission coils, those that are to be energized to
feed power in accordance with a position of the movable stage, and a
power feed unit configured to supply AC power to the power transmission
coils to be energized through the switch unit. The power reception coil
includes a plurality of power reception coils arrayed in a driving
direction of the movable stage, and the power reception coils and power
transmission coils are phase-shifted from each other by 180.degree./n
where n is the number of power reception coils arrayed in the driving
direction of the movable stage.