Patent ID: 8884254

Claim:
A multi charged particle beam writing apparatus comprising: a stage configured to mount a target object thereon; an emission unit configured to emit a charged particle beam; an aperture member, in which a plurality of openings are formed, configured to form a multibeam by letting a region including a whole of the plurality of openings be irradiated with the charged particle beam and letting portions of the charged particle beam respectively pass through a corresponding opening of the plurality of openings; a plurality of electromagnetic lenses, directions of whose magnetic fields are opposite; and three or more electrostatic lenses, at least one of which is arranged in each of the magnetic fields of the plurality of electromagnetic lenses and one or more of which also serve as deflectors for collectively deflecting the multibeam onto the target object, wherein the multibeam is deflected by a two-state deflection of main and sub stages, and two of the three or more electrostatic lenses serve as two main deflectors being the deflectors for performing a main stage deflection of the two-stage deflection, the apparatus further comprising a sub deflector for performing a sub stage deflection of the two-stage deflection, the sub deflector being provided to be arranged between the two main deflectors.