Patent ID: 8547518

Claim:
A stage apparatus comprising: an X-Y stage configured to move in X-axis and Y-axis directions; a stage base plate provided on the X-Y stage, a through-hole being formed on the surface of the stage base plate; a fine adjustment stage configured to move relative to said stage base plate; and a component, which has (i) a coil configured to drive the fine adjustment stage relative to the stage base plate, placed on a surface of the stage base plate, and (ii) a cooling unit placed on the surface of the stage base plate, which cools the coil with a coolant, wherein a coolant channel, which communicates with the through-hole of the stage base plate, is formed inside the stage base plate, and the coolant is supplied to the cooling unit via the coolant channel and the through-hole, without passing through a pipe between the through-hole and the cooling unit.