Patent ID: 8748843

Claim:
A charged particle beam drawing apparatus comprising: a drawing unit configured to perform drawing on a workpiece on a stage by using a charged particle beam; a plurality of marks which are located on the stage and have heights different from each other; an irradiation position detector configured to, when any of the marks is irradiated with the charged particle beam, detect an irradiation position of the charged particle beam on a mark surface of the mark; a drift-amount calculation unit configured to calculate a drift amount of the charged particle beam on the mark surface by using the irradiation position detected by the irradiation position detector; a drift-amount processing unit configured to obtain a drift amount on a workpiece surface by using the drift amounts on at least two of the mark surfaces calculated by the drift-amount calculation unit; a drawing controller configured to correct an irradiation position of the charged particle beam by using the drift amount on the workpiece surface obtained by the drift-amount processing unit; a reference height member serving as a height reference for the workpiece surface and provided for focusing the charged particle beam on the workpiece surface; and a stage lifting mechanism configured to lift and lower the stage, wherein when the reference height member and the workpiece surface are made flush with each other by lifting or lowering the stage by the stage lifting mechanism, the drift-amount processing unit selects, from the plurality of marks, a mark having the height lower than a height of the workpiece surface and a mark having the height higher than the height of the workpiece surface, and obtains the drift amount on the workpiece surface by using the drift amounts on mark surfaces of the two selected marks.